Sorry everyone a little bit of a mess up. The visualization I showed with zooming in on the earth if the universe was spherical is not actually what it would look like. That is what it would look like if you actually left earth on a spacecraft and approached earth. If you only zoomed in, you would actually see a portion of earth in any part of the sky because the entire image of the back of the earth would “lens” across the whole sky dimly so that the most distant point in the universe is some point on earth. If you understand the difference then raise your hand🙋♂️
I try to get my 3 year old daughter to watch educational shows for kids, but she always says no thank you. So I started playing your videos and showing them to her, and she sat through the whole thing, then afterwards wanted to go do an experiment with me! Thanks for that :)
If it's boring, nobody likes it, not even adults and not even people that wanna learn the video's contents and endure them. This guy's videos makes everything interesting and, when possible, even practical, even if it's simple. That's the secret
Incredible! I'm the chairman of a scientific organization and think your ability to communicate complex ideas may be the best I have ever witnessed. Whatever you're doing, don't change how you do it!
it's so amazing how he takes the most complicated topics and is able to break them down so that everybody can understand them. you can only do that if you know your stuff really well and it seems like he does. information like this has become so rare and i really love learning things on this channel. it keeps me engaged with how science actually applies to nature and my life, that its not just boring theories. too many uni teachers dont get that sadly.
Although watching ActionLabs vids all day is super fun, there’s a lot more to teaching like teaching actual equations which includes lots of boring lecture and homework, not to mention grading and dealing with management!
@@timothypickarski5234 Yeah, was going to say that analogies and concepts like this can be fun, but the maths required to prove it is a whole different story.
Um, no. That could not be true because the "large triangles" would have a sum of the angles greater than 180. The universe is expanding everywhere at the same rate, not on some theoretical surface of a sphere. It would be closer to the truth to say that the universe is infinite (probably) and is expanding (at least were we can see and test).
He didn't really explain it well then. I agree. And most of the viewers don't understand it either, but because they can parrot what he said, they think they understand it.
@@noahway13 the 90 degree triangle got me like if I shrunk that big triangle it would be the same triangle that she Drew in the first place I am just really confused
YES! This was super interesting, and you have a talent for explaining complex things in a way that is easy to understand the basic concept. Also, if you could make a video every day so I don't have to wait as long, that'd be great :)
@@Purpled_EyeTV And you should stop comenting other peoples coments 😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭
@@souless2315 Wasn't the big ban an explosion of energy in a spherical form ? If it was then the universe would be spherical, I guess ?! really not sure...
Wow finally an explanation of the shape of the universe that makes sense! You do such an awesome job explaining things and use perfect analogies. You add so much value to the world. So glad you exist and do this. Thank you!
Arınç ÜNALyes because I watched this a long time ago looks like you haven’t watched a thing and I was watching this with headphones on while cleaning so stop judging before knowing
I really enjoyed this episode. It sparked a few thoughts. If the universe was curved 4d sphere and we looked in any direction, the light would travel in a straight line at speed of light, so by looking far away we would see the past picture of the space where we currently are, but because we are constantly moving through the universe we wouldn't see ourselves but a past image of the same space filled with something else. Also if Alice travelled alongside the light in her flat spherical universe in a straight line but at slower speed, she would initially see past image of the same space (before she was there) and as she travels slower than light at some point she would see the point of time when she started her travel and obviously her journey would take some time, so she would arrive to the same point in the future when she is no longer there. The location of the point when she would see the moment when she started her travel would probably depend on the ratio of her speed of her compared to the speed of light. For some part of her journey, she would see the past relative to the point of time that she started and then she would see the future after she left.
Oooo that’s one really interesting theory, but won’t Alice have to travel faster than light so she can catch up with the image of herself before she traveled?
My most favourite Physics teacher ever..❤❤❤ Lots of respect and love from India and from my side Sir..🙏 Keep teaching us like you always do.. A big fan of your explanations..🤗🤗
Hey an astronomer here. Just to clarify, in cosmology we usually and often times use the Freidman Equation, including to determine the shape of the universe. But actually this is a pretty interesting explanation.
Isn’t the observable universe about 90 billion light-years across, 45-46 billion light-years to the cosmic horizon in either direction? Great videos btw. The one showing what a sphere moving in 4 spatial dimensions would look like was amazing. Blew my mind.
Someone else did a video about that trying to explain the distance discrepancy but I can't remember the answer. I think I fell asleep. It was a long video. lol
Yeah, but that's only what we can observe. Just what light has been able to reach us, not the objective size of our universe. Also I have no idea what you're trying to say.
Random physics fantasy: every rotating system in our 3d space becomes a disk shape because centripetal/cetrifugal force only works in 2 dimensions, the periphery all moves in 2 (XY) dimensions at a steady speed through all coordinates equally, it won't form a ball (if it did the surface points all move at different speeds depending on latitude. What if in 4 dimensional space it could form a ball where the whole surface is moving at equal velocity through every point on the surface at equal speed? Picture a spinning disk and imagine spinning it on a third axis so it looks like a ball but instead of having a central axis like earth, all the disks spin through each other in a very 'quantum' way where every point on the surface appears to move at exactly the same speed regardless of where you observe it. That is how I imagine 4 dimensional space. Like the 4D cube example (tesseract), where each axis is the same length in 4 dimensional space but they look different in 3 dimensions.
No because in a spherical universe light would still travel in a straight line. It would curve only if the entire universe resided on the circumference of the sphere like the girl on the ball.
you could still possibly see your past self if the gravitational pull bend the light exactly right. This means that in the future we might use black holes to look at the past (since they can bend some light back at you )
According to Einstein theory, Past present and future are happening at the same time. So, if you want to see the past you have to look for your parallel self.
I think technically, yes, but it would still require the light from our past selves to reach us. Since none of this light has ever reached us, even if it could theoretically, we haven’t lived long enough / the universe hasn’t existed long enough for the light of our past selves to reach us.
The video and hypothesis only makes sense for something on the outside of a body. The thing is we are not on top of the universe, but inside it. That means that the hypothesis of the universe being flat can not hold.
I’ve never seen a slinky used to show how the universe is expanding. That is extraordinary and makes perfect sense. It really is the perfect visual for it.
1. Light doesn't travel in a straight line it travels in waves, and we are able to perceive some of those waves after they reflect off the surface of an object. 2. If an object is 2d, would it have the ability to see another 2d object or just the line/points that make up one side of an object in front of them? 3. If an object lived in 2d, would they live by sliding across the surface of it's dimension or would it rotate, moving the length of one side so it can move it's points to another area? like we move forward by moving a 3d leg, the equivalent volume of that leg forward and pulling ourself to the next volume of space. 4. She cannot draw a line being a 2d object because if she could only see straight she could not draw anything but a line that is intersecting her view and if she were to rotate that line so that it was flat as to draw another line that is attached to it, eventually creating a 2d object, she'd never be able to perceive the 2d area of that object even if she knows the exact length of each line. 5. And if she can only perceive up and down, she could not perceive distance either. If she could not perceive distance she probably couldn't travel at all without extreme worry, because she would never be sure how close she is to another object except by how bright the object was??? 6. And another question is, would she see our light that refracts off things on their surface areas... or would she just see the dye in which things in her world are colored with. And if that's the case, would she only actually see the color black and be unable to distinguish colors from each other? This would also render her unable to draw, because vision as we know it, is the ability to perceive light and perceiving only black is the opposite of perceiving light. Being unable to see, she could draw but not bare witness to what she was drawing. She'd infact be a prisoner in 2d space. She'd be unable to perceive distance, and so if she could move she'd probably be afraid to do so. And if she drew, she'd not be sure how close the line she could draw, would be to her. Basically the point here is that 2d, is actually just having length and width. If she could see outward from her piece of paper and moved perpendicular as was her vision, she'd moving her vertically oriented 2d body across a 3d plane horizontally. I'd assume that her main limitation would be the inability to move left or right but having the ability to see length [up and down] and depth. [in and out.] [She'd have to have another side of her that has eyes drawn on the back of her horizontally oriented body... OR! She could see left and right, up and down, but no depth and so turning backward would be dangerous and but she could then perceive the surface she was on without being flat with it and also be able to look up away from it. But I feel at this point if she is moving back left right up and down but without depth, she'd still be essentially 3d because of her ability to see the dimension that she is contained in from a technically outside view but just unable to see herself and also despite unable to see depth would actually be able to perceive that if there was an object she could perceive that was not touching her, witness depth despite not perceiving it. This is the same as us not being able to see through time, but able witness it's effects on objects. [Aka what makes us 4th dimensional despite our 3d shapes.] This is a weird thought process I am gonna drop it now. Lol.
Yeah bud I think you took the example waaayyyyyy too literally. Basically this is a kindergarten lesson for astrophysics (for which you and me alike are students). Now I'm not going to pretend to understand anything past the 3rd dimension (I think anyone saying "naaa the 4th dimension is time, I'm smart" is just a bit of a copout), but I would say (along with the maker of this video) that the same concepts for a 2nd dimension colony trying to work out if they were in a 3rd dimensional universe would be somewhat similar to us working out if we were in a 4th dimension universe. This obviously isn't the most 100% accurate analogy to make, but thats what happens in kindergarten classes - people who don't know heaps about a subject need a more basic lesson on whats happening. I have a way better idea about a few things to do with spacetime and multi-dimensional factors just watching this than I did after watching a super complicated Vsauce video "Which Way is Up?" which talked about spacetime for 10 mins and I did not understand the last 9 minutes of it. So rather than being a smartass and wasting your time picking at the threads of his representation of a 2D world, how about learning something and appreciating how excellent this video was? Great video btw
I have to say this is one of the best descriptions of the shape of the universe I've ever seen. I think the big difference is the use of the spherical ball and aluminum foil. It was a deceptively simple prop that really helped picture a very difficult concept. Great work!!!!!!!
Everyone knows that Flat Earthers do not exist. They are bored NASA employees with a predilection for online pranks. Flat Earth is an aerospace hoax. But that doesn't mean that the Universe has a shape. Or that the Big Bang happened, or that we should even take that idea seriously as a valid scientific concept.
@@Chicken_Little_Syndrome Is the Big Bang a hypothesis? Yes, but until there is a better hypothesis that fits the observational data, I'll stick with the Big Bang for now.
If there was a 'big bang' and we live in a spherical universe, then we're going to collide with other galaxies once we reach the other side of the sphere.
@Andrey A. Could you elaborate on "namespaces in Linux"? Namespaces are quite common concept in programming I think, but I don't see any example of namespaces in the structure of Linux-based systems
This a channel for regular humans who run away from the PBS youtube channel because of how complicated those explanations get on that side......i've subscribed!
So I’m 2 dimensional? ......... oh wait you said “FLAT” 😂 Great video as always I never realised learning could be so much fun! Where were you when I went to school.
Mind blowing, amazing video. So eloquently done. Thank you! So, if a universe is flat you could look outwards at any angle and always be looking away from yourself. If that universe were infinite, you would never se the end (wall or edge). If it were not infinite, you would eventually see the edge once it stops expanding. If a universe is curved, you could look outward at any angle and always be seeing back at you from that angle. it would be like seeing back at you from far far away, but the image would be stretched 360 degrees all around you (kind of like a fun house). If that universe were infinite, you would never reach that image of yourself? If it were not infinite, would you hit the edge and zap to the other side of the universe sphere? that doesn't make sense in our reality. Does "Infinite" even apply to a universe like this? Is it like the opposite of infinite? One way I can think of visualizing a curved universe in our reality is by imagining you are in the center of a big sphere with a mirrored surface on the inside. Everywhere you look would be looking back at you, and your image would be stretched 360 around you. But, only if you stay in the exact center of the sphere. If you move you lose the 360 Lens effect. So, this would not be a reality in a curved universe. Moving in a curved universe is not like moving away from the center of a sphere, you would always be in the center of the universe as you move. We would have to think about moving in a curved universe in a different way. I'm not sure it matters since our universe is flat. However it may have something to do with a 4th dimension if it exists. Happy learning =).
@@OF01975 what are you talking about? There's no water coloring in oranges. And what does this even have to do with oranges tasting weird after you brush your teeth?
This must be the only video in which you didn't go: "ready? so, 1... 2... 3..." Fascinating subject! thank you for sharing your incredible wisdom and research
"Today's scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality." - Nikola Tesla
Jordan Daniel “Einstein’s relativity work is a magnificent mathematical garb which fascinates, dazzles and makes people blind to the underlining errors. The theory is like a beggar clothes in purple who ignorant people take for a king...it’s exponents are brilliant men but they are metaphysicists rather then scientists”-Nikola Tesla ...and Tesla was wrong
@@joshuawilliams4695 , right. People have done experiments and made observations that have tested the shit out of Einsteins's relativity work and since it has held up, that is the only reason we care so much about Einstein and his work still.
@@jongyuemei Nah like, I know it's Tesla..it's just...a theme more or less discussed in Simulacra and Simulation, as well. Sort of like a nod to it. You should read it.
I am suffering headache 🤕 after watching this video and thinking about the shape of the universe! Don’t waste your precious time in thinking about theories and calculating the shape and angles of triangles ! Just use the minecraft’s theory and think that the universe is cubical 😆
This ultimately means that once we finally overcome the flat-earthers, we will inevitably have to deal with the flat-universers. Or curved-universers, depending on the science.
Wouldnt we see a dot (earth) in the center of our vision, behind the stars? Like Sue, she would see the back of her head from far away but only where she'd be looking at, wouldnt she?
When you mentioned that light in Sue universe (the sphere) travels in "straight" line (following the 3D curve of the sphere surface) I just realize that it's possible to make that for real ... and w/o a Black hole that is - ie much cheaper! :) It just needs a hollow sphere with somewhat thin wall, which have internal reflection angle to match its curvature, so that when you shoot a beam of light on some tangent point inside the that layer it would reflect following the curve of the sphere. You've actually performed very similar experiment when you shoot your laser thru a flow of water, and as the flow of water (shot horizontally) curved down by the gravity, so did the light of the laser, reflected internally in that water flow.
When will you upload video about How to make time machine at home?? This is my 4th try asking you that question and i will asking that till you answer me. Sorry for my English
There's no need to keep asking, because he already made the video you requested sometime in the distant future, and then traveled back to yesterday to upload it.
@@seymoronion8371 what you said is lil bit confusing. I am asking for tutorial for how to make time machine for killing all mumble rappers they kinda pisses me off
ACTION LAB: Curious to know. If we have a starting point (date) of the big bang are we able to calculate a proposed speed of expansion for the edge of our Universe. Also can we determine which direction and/or galaxy ours may have been born from?
It’s is currently denied in science that there is an edge to the universe...Even if it’s flat. Every point in the universe looks as though it is at the exact center of the universe. (Begin existential crisis now)
The current entire observable universe is what the starting point contained. Everything you can see from here was the starting point. As such, the starting point was in every direction visible from here. Hard to grasp, but observably and provably true.
youre thinking too relative fixers to our limited perceptions , space time energy etc ,everything that exists is merely a reality our brains can only decipher from what actuality actual is ,for all u know nothing actually exists but calculations
@girlsdrink: René Descartes, I think, therefore I am. Which means for all you know you are real and all of us are calculations. For all The Action Lab knows, he is real and you are a calculation.
A concept that is misunderstood: when the universe expands, it scales which means that you still feel like moving the same distance, but the only that can probably tell the difference are beings that live in a higher dimension. The reason I say probably is because what might be happening is that actually the top dimension might be expanding aswell thus expanding all lower dimensions seamlessly.
@@Amy-si8gq An ever expanding globe with trillions of galaxies inside. Expanding in all directions in 3 dimentions like how a small star like our sun will expand into a red giant.
he likes to reads this shit out of papers and now he makes money out off it... this guy won't be able to discover new formulas or anything new.. he just doesn't have the proper mindset and thinking tactics or algorithms
I am 44 years old, apart from the scientific articles I have read, I have only watched hundreds of videos on youtube, this is the first time I see such a clear and simple explanation, bravo! A few months ago, I watched a theoretical simulation of what a person falling into a black hole might see before passing through the event horizon and being trapped on the black hole's "surface". I think this logic is valid on a minimal scale in the world. Now it is better understood why there are so many believers in the "flat earth" fallacy. Flat earthers are partially right, the world is flat from their point of view. A spherical curve can never be seen on a spherical surface anyway, because wherever you look, you are on the surface. But reason and logic are another subject that focuses on non-natural fantastic things.
I’m guessing you meant to reply to the comment saying that his shirt is still thinking. It was a joke comment. Of course he knows the shirt itself is not thinking
Sue should know she lives in a infinite plane. She should see herself looking in every direction judging by the way she can see the cat. Edit: just saw the part at 5:00
Ali_Army107 for them, a sphere is a 3D version of a curved line in their universe. It is something they cannot imagine for sure, but they can work with mathematically.
Same way we can extrapolate how a 4d shape would behave, by looking the progression of characteristics that dictates the behavior of a 1d shape, how it translates into 2D, then take those 2D and compares to a 3D then finally extrapolates a 4D object. If you own VR set check out "4D toys" or watch a video about 4d objects it is really interesting.
We have names like hyperplane, tesseract (aka hypercube), pentatope, etc for 4d shapes too if that is closer to what you meant. Another instance for that are irrational numbers which we can name and interact but the actual quantity for them we can never picture in our minds to their full extent.
your math is beyond my scope, but I can tell you that the thumbnail is amazing. no joke the beautifully colored universe touching the mirrored half globe really does look cool.
Sorry everyone a little bit of a mess up. The visualization I showed with zooming in on the earth if the universe was spherical is not actually what it would look like. That is what it would look like if you actually left earth on a spacecraft and approached earth. If you only zoomed in, you would actually see a portion of earth in any part of the sky because the entire image of the back of the earth would “lens” across the whole sky dimly so that the most distant point in the universe is some point on earth. If you understand the difference then raise your hand🙋♂️
The Action Lab 🙋🏻♀️
can you make electricity with magnetic fields If you spin them fast enough
So the earth is flat or what?
So you mean......it's fake
🙋
I try to get my 3 year old daughter to watch educational shows for kids, but she always says no thank you. So I started playing your videos and showing them to her, and she sat through the whole thing, then afterwards wanted to go do an experiment with me! Thanks for that :)
If it's boring, nobody likes it, not even adults and not even people that wanna learn the video's contents and endure them. This guy's videos makes everything interesting and, when possible, even practical, even if it's simple. That's the secret
Scramalope hi
really? That does not seem like a video interesting for a 3 y/o old. Did she understand anything?
You can also show her the videos of aumsum time
So your 3 year old daughter knows general relativity and geoemetry. Don’t bullshit
Incredible! I'm the chairman of a scientific organization and think your ability to communicate complex ideas may be the best I have ever witnessed. Whatever you're doing, don't change how you do it!
it's so amazing how he takes the most complicated topics and is able to break them down so that everybody can understand them. you can only do that if you know your stuff really well and it seems like he does. information like this has become so rare and i really love learning things on this channel. it keeps me engaged with how science actually applies to nature and my life, that its not just boring theories. too many uni teachers dont get that sadly.
The 2 dimensional Bob and Sue are smarter than the average flat- earther..
Lmao
you won bro
I'm a flat-universer
Flat earth!
Bruhh 😂😂😂
I wish I had him as a teacher in math and physics. Would have been a hell of a lot more interesting.
Action Lab has strong "mad scientist" vibes. Hell yeah it'd be more interesting.
Although watching ActionLabs vids all day is super fun, there’s a lot more to teaching like teaching actual equations which includes lots of boring lecture and homework, not to mention grading and dealing with management!
@@timothypickarski5234 Yeah, was going to say that analogies and concepts like this can be fun, but the maths required to prove it is a whole different story.
The world is not simple as you think
true
This is one of the best channel for learning science , Worth subscribing....Really he does a lot of work.
from Tamil nadu...
I am his biggest fan ..
r u !
Even I am
no
Ok
Alan are you happy.
So basically we could be an expanding balloon...
That's it. :P
Well no shit
Um, no. That could not be true because the "large triangles" would have a sum of the angles greater than 180. The universe is expanding everywhere at the same rate, not on some theoretical surface of a sphere. It would be closer to the truth to say that the universe is infinite (probably) and is expanding (at least were we can see and test).
@@earthman4222 the big bang is false
@@nowonmetube tell that to your mother.
"Now that we understand......." I'm still confused.
Same
It is extremely simple video. Check the videos from PBS Space Time. They are more complex and detailed, but more satisfying once you understand them.
He didn't really explain it well then. I agree. And most of the viewers don't understand it either, but because they can parrot what he said, they think they understand it.
It's phlat to keep it simple
@@noahway13 the 90 degree triangle got me like if I shrunk that big triangle it would be the same triangle that she Drew in the first place I am just really confused
When you learn more stuff from an 11min video about some guy playing with a ball, aluminum foil and kid stickers than in an entire year in school
True
True af man
True
True that
Yeah fr! Fuck school we need to rely on youtube!! ( that was a joke please don't comment on every single reason why that s a bad idea) lmao
Legend says his Shirt is still thinking
Ok
It's still thinking.... I wonder what it'll say once it finishes thinking after decades.... Or maybe more?
Its gonna say.
Hi
I’ve seen this comment like 6 million times
I like your “I’m Thinking” shirt.
Damn it man! You need to make more of these cosmos videos. I've never seen any of it explained with such great ease. You're just too good. 💛
Mmmmmmmhm
YES! This was super interesting, and you have a talent for explaining complex things in a way that is easy to understand the basic concept. Also, if you could make a video every day so I don't have to wait as long, that'd be great :)
@@Scramalope note: he is not full time cuz he has a different job too
@Arizona person No he's not, ur just jealous that he's smarter than u.
Check Vsauce
#Flatuniverser
The universe is hollow, heathen!
I’m more of a curved universerer myself.
Actually this could be a valid argument, since we really just don’t have enough to go on to determine whether or not it is spherical or flat.
Fck gravity, all hail flat universe
How on earth could it be flat!!. It's definitely positively curved.
Sue: makes a triangle with three 90 degree angles
My math teacher: impossible
I have said it before, but nobodt belived me😫😭
@@Orikix STOP USING THE STUPID CRY IMOJI
@@Purpled_EyeTV And you should stop comenting other peoples coments 😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭😭
@@Orikix child.
@@schwarz8614 no I am 25
300 flat universers *disliked* this video
abde bout but we still don’t know if the universe is flat or spherical.
@@souless2315 Wasn't the big ban an explosion of energy in a spherical form ? If it was then the universe would be spherical, I guess ?! really not sure...
@@bababoey1250 EXACTLY WHAT I THOUGHT!
A whole bunch of people just got wooooshed, good job
495 flat earthers
There was a young lady named bright
Whose speed was much faster than light.
She set out one day In a relative way, And returned the previous night.
Nice! Im a poet too xD
Wow finally an explanation of the shape of the universe that makes sense! You do such an awesome job explaining things and use perfect analogies. You add so much value to the world. So glad you exist and do this. Thank you!
I know exactly where those human stickers come from lol, my kid has that sticker playset thing
Haha nice
This was so entertaining to watch keep up the awesome work
Arınç ÜNALyes because I watched this a long time ago looks like you haven’t watched a thing and I was watching this with headphones on while cleaning so stop judging before knowing
*yes
I really enjoyed this episode. It sparked a few thoughts.
If the universe was curved 4d sphere and we looked in any direction, the light would travel in a straight line at speed of light, so by looking far away we would see the past picture of the space where we currently are, but because we are constantly moving through the universe we wouldn't see ourselves but a past image of the same space filled with something else. Also if Alice travelled alongside the light in her flat spherical universe in a straight line but at slower speed, she would initially see past image of the same space (before she was there) and as she travels slower than light at some point she would see the point of time when she started her travel and obviously her journey would take some time, so she would arrive to the same point in the future when she is no longer there. The location of the point when she would see the moment when she started her travel would probably depend on the ratio of her speed of her compared to the speed of light. For some part of her journey, she would see the past relative to the point of time that she started and then she would see the future after she left.
Oooo that’s one really interesting theory, but won’t Alice have to travel faster than light so she can catch up with the image of herself before she traveled?
Also, what if light as it was propagating backwards and forwards destructively interfered with itself and you couldn't see anything at all!
My most favourite Physics teacher ever..❤❤❤ Lots of respect and love from India and from my side Sir..🙏 Keep teaching us like you always do.. A big fan of your explanations..🤗🤗
Sometimes I watch The Action Lab videos even when I don't understand anything.
Markos Karam so true🤣
Hey an astronomer here. Just to clarify, in cosmology we usually and often times use the Freidman Equation, including to determine the shape of the universe. But actually this is a pretty interesting explanation.
Isn’t the observable universe about 90 billion light-years across, 45-46 billion light-years to the cosmic horizon in either direction?
Great videos btw. The one showing what a sphere moving in 4 spatial dimensions would look like was amazing. Blew my mind.
Someone else did a video about that trying to explain the distance discrepancy but I can't remember the answer. I think I fell asleep. It was a long video. lol
Yeah let’s just walk there bruv it’s not that far
Yeah, but that's only what we can observe. Just what light has been able to reach us, not the objective size of our universe.
Also I have no idea what you're trying to say.
@@Speed001 Brandon is saying that The Action Lab got his numbers wrong
Why is the universe symmetrically distributed around us if we're not at the center of it?
Legend has it that his shirt is still thinking.
I am sinking...
Random physics fantasy: every rotating system in our 3d space becomes a disk shape because centripetal/cetrifugal force only works in 2 dimensions, the periphery all moves in 2 (XY) dimensions at a steady speed through all coordinates equally, it won't form a ball (if it did the surface points all move at different speeds depending on latitude. What if in 4 dimensional space it could form a ball where the whole surface is moving at equal velocity through every point on the surface at equal speed?
Picture a spinning disk and imagine spinning it on a third axis so it looks like a ball but instead of having a central axis like earth, all the disks spin through each other in a very 'quantum' way where every point on the surface appears to move at exactly the same speed regardless of where you observe it.
That is how I imagine 4 dimensional space.
Like the 4D cube example (tesseract), where each axis is the same length in 4 dimensional space but they look different in 3 dimensions.
I literally just looked at the reflection on the ball the entire time
Elmo
Elmo ? Lol
I heard Turncoat as the background music and thought I was going crazy, stop reminding me of the past.
Memento mori
Memento mori
Momento mori.
488 flat earthers disliked this vid 🤣 I'm sharing this vid to my friends when thay say THE EARTH IS FLAT oma go no no no no no ☝️watch this😂
flat earth really has no relation to flat universe
The shape of our universe is actually “👌🏻”. We neck every higher dimensional being
*Even Bob has a gf...*
She’s in a different universe though, I don’t think they will make it with that kind of long-distance relationship
@@TheActionLab lol haha
Btw pls answer my question-
What work you do besides youtubing?
Hes a flatearther on his freetime but he also enjoys eating watermelon when he got time 😊
.. And you dont
@@brotherpabl0 no u
Me, 2 years later: 2:30
“is that... Unus Annus?”
Finally someone realized!!!
Memento Mori :'(
Memento mori, friends
It’s just now starting to hit me that I was part of a death/time cult
@@goaway7785 It's not a cult, it's a family.
If the universe was spherical, then could we see our past lives?
No because in a spherical universe light would still travel in a straight line. It would curve only if the entire universe resided on the circumference of the sphere like the girl on the ball.
Yes, but you’d need a longer telescope then,... you know
you could still possibly see your past self if the gravitational pull bend the light exactly right. This means that in the future we might use black holes to look at the past (since they can bend some light back at you )
According to Einstein theory, Past present and future are happening at the same time. So, if you want to see the past you have to look for your parallel self.
I think technically, yes, but it would still require the light from our past selves to reach us. Since none of this light has ever reached us, even if it could theoretically, we haven’t lived long enough / the universe hasn’t existed long enough for the light of our past selves to reach us.
Roses are red,
Violets are blue,
I just subbed,
So should you!
@Jasper9934 same.
him : we live in a spherical universe
me: i live at my computer desk 0-O
The flat universe society has members all around the globe.
The video and hypothesis only makes sense for something on the outside of a body. The thing is we are not on top of the universe, but inside it. That means that the hypothesis of the universe being flat can not hold.
Ironically
The triangle universe society also has members at all 5 corners of the pyramid
And say that one more time but SSSSLLLLLOOOOOWWWWLLLLLYYYY
The dislikes are the flat eathers not agreeing.
Hahaha! They can't understand this channel because it is out of their universe! 😂😂
@@pilerks1 r/wooosh
Cherries Lo
"And they're two-dimensional.. meaning they're flat"
Dont bully sue...... she didnt get lucky in puberty..........
Hearing the music from 2:11 will never be the same for me after Unus Annus.
😔
The Action Lab ❤️ most of the comments. I wish he ❤️ me too.
The Action Lab thank you so much.
I’ve never seen a slinky used to show how the universe is expanding. That is extraordinary and makes perfect sense. It really is the perfect visual for it.
1. Light doesn't travel in a straight line it travels in waves, and we are able to perceive some of those waves after they reflect off the surface of an object.
2. If an object is 2d, would it have the ability to see another 2d object or just the line/points that make up one side of an object in front of them?
3. If an object lived in 2d, would they live by sliding across the surface of it's dimension or would it rotate, moving the length of one side so it can move it's points to another area? like we move forward by moving a 3d leg, the equivalent volume of that leg forward and pulling ourself to the next volume of space.
4. She cannot draw a line being a 2d object because if she could only see straight she could not draw anything but a line that is intersecting her view and if she were to rotate that line so that it was flat as to draw another line that is attached to it, eventually creating a 2d object, she'd never be able to perceive the 2d area of that object even if she knows the exact length of each line.
5. And if she can only perceive up and down, she could not perceive distance either. If she could not perceive distance she probably couldn't travel at all without extreme worry, because she would never be sure how close she is to another object except by how bright the object was???
6. And another question is, would she see our light that refracts off things on their surface areas... or would she just see the dye in which things in her world are colored with. And if that's the case, would she only actually see the color black and be unable to distinguish colors from each other? This would also render her unable to draw, because vision as we know it, is the ability to perceive light and perceiving only black is the opposite of perceiving light. Being unable to see, she could draw but not bare witness to what she was drawing. She'd infact be a prisoner in 2d space. She'd be unable to perceive distance, and so if she could move she'd probably be afraid to do so. And if she drew, she'd not be sure how close the line she could draw, would be to her.
Basically the point here is that 2d, is actually just having length and width. If she could see outward from her piece of paper and moved perpendicular as was her vision, she'd moving her vertically oriented 2d body across a 3d plane horizontally. I'd assume that her main limitation would be the inability to move left or right but having the ability to see length [up and down] and depth. [in and out.] [She'd have to have another side of her that has eyes drawn on the back of her horizontally oriented body... OR! She could see left and right, up and down, but no depth and so turning backward would be dangerous and but she could then perceive the surface she was on without being flat with it and also be able to look up away from it. But I feel at this point if she is moving back left right up and down but without depth, she'd still be essentially 3d because of her ability to see the dimension that she is contained in from a technically outside view but just unable to see herself and also despite unable to see depth would actually be able to perceive that if there was an object she could perceive that was not touching her, witness depth despite not perceiving it. This is the same as us not being able to see through time, but able witness it's effects on objects. [Aka what makes us 4th dimensional despite our 3d shapes.]
This is a weird thought process I am gonna drop it now. Lol.
Well said my friend.
Yeah bud I think you took the example waaayyyyyy too literally. Basically this is a kindergarten lesson for astrophysics (for which you and me alike are students). Now I'm not going to pretend to understand anything past the 3rd dimension (I think anyone saying "naaa the 4th dimension is time, I'm smart" is just a bit of a copout), but I would say (along with the maker of this video) that the same concepts for a 2nd dimension colony trying to work out if they were in a 3rd dimensional universe would be somewhat similar to us working out if we were in a 4th dimension universe.
This obviously isn't the most 100% accurate analogy to make, but thats what happens in kindergarten classes - people who don't know heaps about a subject need a more basic lesson on whats happening. I have a way better idea about a few things to do with spacetime and multi-dimensional factors just watching this than I did after watching a super complicated Vsauce video "Which Way is Up?" which talked about spacetime for 10 mins and I did not understand the last 9 minutes of it.
So rather than being a smartass and wasting your time picking at the threads of his representation of a 2D world, how about learning something and appreciating how excellent this video was?
Great video btw
Either way, Shaun, the commentor made it much more clear and precise.
Wow! You an astrophysicist or something?
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Just Kidding! 😂😂😂
You dumb!
You have a lot to study. All the best.
This was great l loved it!
I have to say this is one of the best descriptions of the shape of the universe I've ever seen. I think the big difference is the use of the spherical ball and aluminum foil. It was a deceptively simple prop that really helped picture a very difficult concept. Great work!!!!!!!
Woah that’s different from my 7d universe
Then why do u has a 3d image. *epic mag music plays, but the mag cops come to me and kill me for cringe*
*mlg
2100: “The universe is NOT FLAT. It is SPHERICAL! Are you stuck in 2010?”
Are we already in the year 2100?
Everyone knows that Flat Earthers do not exist. They are bored NASA employees with a predilection for online pranks. Flat Earth is an aerospace hoax. But that doesn't mean that the Universe has a shape. Or that the Big Bang happened, or that we should even take that idea seriously as a valid scientific concept.
@@Chicken_Little_Syndrome Is the Big Bang a hypothesis? Yes, but until there is a better hypothesis that fits the observational data, I'll stick with the Big Bang for now.
Uhm actually by the end of last year it's been proven (with math) that the universe has positive curvature or it *is* spherical
Chicken Little Syndrome the Big Bang is more of a theory than a hypothesis since it has yet to be proven false despite all of its tests.
so totally understood what you shared for the first time in my life :) great channel!
Bob and Sue?? Where is Alice? When did they break up?
That's a different kind of triangle.
If there was a 'big bang' and we live in a spherical universe, then we're going to collide with other galaxies once we reach the other side of the sphere.
@Andrey A. Could you elaborate on "namespaces in Linux"? Namespaces are quite common concept in programming I think, but I don't see any example of namespaces in the structure of Linux-based systems
@Andrey A. what about the cold spot
This a channel for regular humans who run away from the PBS youtube channel because of how complicated those explanations get on that side......i've subscribed!
So I’m 2 dimensional? ......... oh wait you said “FLAT” 😂
Great video as always I never realised learning could be so much fun!
Where were you when I went to school.
This is a universe
Don't got you slipping up
Look what I'm whipping up
You were the first one to mention that! Ever since I wrote that on the thumbnail I couldn’t stop singing “this is a universe”
@@TheActionLab awesome haha, love your videos btw! You're a very smart dude
BARS
Their observations are so smart and cute, I think the 4d beings think to themselves
We have a Flat Earth society now let's have Flat Universe society
Can I switch you with my Science teacher
Flat Universers lmao
@@Welowas Ye XD
flat earthers already knew this was true. its the globalists that are just figuring it out.
Mind blowing, amazing video. So eloquently done. Thank you!
So, if a universe is flat you could look outwards at any angle and always be looking away from yourself. If that universe were infinite, you would never se the end (wall or edge). If it were not infinite, you would eventually see the edge once it stops expanding.
If a universe is curved, you could look outward at any angle and always be seeing back at you from that angle. it would be like seeing back at you from far far away, but the image would be stretched 360 degrees all around you (kind of like a fun house). If that universe were infinite, you would never reach that image of yourself? If it were not infinite, would you hit the edge and zap to the other side of the universe sphere? that doesn't make sense in our reality. Does "Infinite" even apply to a universe like this? Is it like the opposite of infinite?
One way I can think of visualizing a curved universe in our reality is by imagining you are in the center of a big sphere with a mirrored surface on the inside. Everywhere you look would be looking back at you, and your image would be stretched 360 around you. But, only if you stay in the exact center of the sphere. If you move you lose the 360 Lens effect. So, this would not be a reality in a curved universe. Moving in a curved universe is not like moving away from the center of a sphere, you would always be in the center of the universe as you move. We would have to think about moving in a curved universe in a different way.
I'm not sure it matters since our universe is flat. However it may have something to do with a 4th dimension if it exists. Happy learning =).
COPY PASTE ALERT!!!
Great video 👍
First! Not because I was here first but because I identify as first.
lol
The universe is CGI.
Yeah but what shape did they CGI it to be?...
_(Has existential crisis)_
Cool Geometry Information
PowahSlap Entertainmint do watch draw with jazza
Woah my brain
I like the down shot onto the silver sphere. Reflecting that good looking chandelier was smart :) It gave it an "astronomical" look.
Can you explain the science behind drinking orange juice after brushing your teeth? I would love to know, thanks!
He said it already in a video where he explains how oranges burst ballons.
Been there done that. You must be a new subscriber.
The water coloring in oranges stains ur teeth after u brush em cuz whn u brush em they get soft and sticky
@@OF01975 what are you talking about? There's no water coloring in oranges. And what does this even have to do with oranges tasting weird after you brush your teeth?
ThePrufessa think he’s a troll from his other comments,
If not he’s just a nobhead
🤯
Now i know what this smiley is meant for..
😱
What! Tell me!
This must be the only video in which you didn't go: "ready? so, 1... 2... 3..."
Fascinating subject! thank you for sharing your incredible wisdom and research
"Today's scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality." - Nikola Tesla
Simulacra and Simulation...
Jordan Daniel “Einstein’s relativity work is a magnificent mathematical garb which fascinates, dazzles and makes people blind to the underlining errors. The theory is like a beggar clothes in purple who ignorant people take for a king...it’s exponents are brilliant men but they are metaphysicists rather then scientists”-Nikola Tesla
...and Tesla was wrong
@@MorpheusOmikron lol tesla
@@joshuawilliams4695 , right. People have done experiments and made observations that have tested the shit out of Einsteins's relativity work and since it has held up, that is the only reason we care so much about Einstein and his work still.
@@jongyuemei Nah like, I know it's Tesla..it's just...a theme more or less discussed in Simulacra and Simulation, as well. Sort of like a nod to it. You should read it.
you are amazing man
too deep lessons
even my whole school life i didnt learned these much
thank u a lot
keep doing
This is literally the best description of other dimensions I've ever watched. Thanks!!
6:25 illuminati confirmed
Pls come out of Illuminati's 🤖😺🙀😿
Lmao
I am suffering headache 🤕 after watching this video and thinking about the shape of the universe! Don’t waste your precious time in thinking about theories and calculating the shape and angles of triangles ! Just use the minecraft’s theory and think that the universe is cubical 😆
This guy has an amazing knack for explaining the unexplainable in less than 12-minutes. Good job there sir!
This ultimately means that once we finally overcome the flat-earthers, we will inevitably have to deal with the flat-universers. Or curved-universers, depending on the science.
Actually you would see a very distorted planet earth. It would cover more than the half of the sky. Behind all of the stars.
You are correct
Just correct your spelling first.
@@TheActionLab but why so big ? Because light has to cover a really long distanse to reach the other side of us . Please explain🙁
Cahidi Joyo Raharjo Done
Wouldnt we see a dot (earth) in the center of our vision, behind the stars? Like Sue, she would see the back of her head from far away but only where she'd be looking at, wouldnt she?
When you mentioned that light in Sue universe (the sphere) travels in "straight" line (following the 3D curve of the sphere surface) I just realize that it's possible to make that for real ... and w/o a Black hole that is - ie much cheaper! :)
It just needs a hollow sphere with somewhat thin wall, which have internal reflection angle to match its curvature, so that when you shoot a beam of light on some tangent point inside the that layer it would reflect following the curve of the sphere.
You've actually performed very similar experiment when you shoot your laser thru a flow of water, and as the flow of water (shot horizontally) curved down by the gravity, so did the light of the laser, reflected internally in that water flow.
When will you upload video about How to make time machine at home?? This is my 4th try asking you that question and i will asking that till you answer me.
Sorry for my English
There's no need to keep asking, because he already made the video you requested sometime in the distant future, and then traveled back to yesterday to upload it.
@@seymoronion8371 what you said is lil bit confusing. I am asking for tutorial for how to make time machine for killing all mumble rappers they kinda pisses me off
Totally out of context question.
I see you have Eminem as your profile picture so I just wanted to ask.
When is Eminem responding to MGK?
@@TheOmniforreal soon
@@TheOmniforreal eminem just posted lucky you music video on instagram hope he will diss mgk soon
for a second i thought u were gonna say the earth is flat
You seriously make me feel so insignificant.... Lol. Great video as always. Idk how many of them I've watched at this point.
Ah yes, I remember flatland from Carl Sagan's Cosmos
ACTION LAB: Curious to know. If we have a starting point (date) of the big bang are we able to calculate a proposed speed of expansion for the edge of our Universe. Also can we determine which direction and/or galaxy ours may have been born from?
It’s is currently denied in science that there is an edge to the universe...Even if it’s flat. Every point in the universe looks as though it is at the exact center of the universe. (Begin existential crisis now)
The current entire observable universe is what the starting point contained. Everything you can see from here was the starting point. As such, the starting point was in every direction visible from here. Hard to grasp, but observably and provably true.
brutally_honest, no.
youre thinking too relative fixers to our limited perceptions , space time energy etc ,everything that exists is merely a reality our brains can only decipher from what actuality actual is ,for all u know nothing actually exists but calculations
@girlsdrink: René Descartes, I think, therefore I am. Which means for all you know you are real and all of us are calculations. For all The Action Lab knows, he is real and you are a calculation.
A concept that is misunderstood: when the universe expands, it scales which means that you still feel like moving the same distance, but the only that can probably tell the difference are beings that live in a higher dimension. The reason I say probably is because what might be happening is that actually the top dimension might be expanding aswell thus expanding all lower dimensions seamlessly.
I always assumed the universe was a 3d sphere we're trapped inside.
Like a snowglobe?
@@Amy-si8gq
An ever expanding globe with trillions of galaxies inside. Expanding in all directions in 3 dimentions like how a small star like our sun will expand into a red giant.
I learned more from this one video than I have in 8years of school... smh
Awesome explanation bro no one can post videos or explain the things more than u in the entire RUclips... Hatsoff...
Sue could just look and notice she can see herself when the universe curves back.
EDIT: Wow 2 seconds later you say that.
WHY DOESN'T NASA OFFERS HIM A JOB?
he likes to reads this shit out of papers and now he makes money out off it... this guy won't be able to discover new formulas or anything new.. he just doesn't have the proper mindset and thinking tactics or algorithms
NotLegal ur a clown man
@@swagcreated9147 if i am a clown because i think that this guy wont ever work for NASA then you are the smartest human alive.
@@notlegal99 wow, nice burn
I am 44 years old, apart from the scientific articles I have read, I have only watched hundreds of videos on youtube, this is the first time I see such a clear and simple explanation, bravo! A few months ago, I watched a theoretical simulation of what a person falling into a black hole might see before passing through the event horizon and being trapped on the black hole's "surface". I think this logic is valid on a minimal scale in the world. Now it is better understood why there are so many believers in the "flat earth" fallacy. Flat earthers are partially right, the world is flat from their point of view. A spherical curve can never be seen on a spherical surface anyway, because wherever you look, you are on the surface. But reason and logic are another subject that focuses on non-natural fantastic things.
Your shirt represent my brain.
No one says his shirt is thinking his shirt says it
I’m guessing you meant to reply to the comment saying that his shirt is still thinking. It was a joke comment. Of course he knows the shirt itself is not thinking
This is probably the best explanation that I've heard.
You said global curvature of the universe at the end instead of the universal curvature of the universe.
Zek Sanchez local and global as in the mathematics graphing terms
5:10 flat-brainers stopped watching and got proof of flat earth xD
The way u explain is so amazing, it makes complicated things make sense, ur channel is amazing
Sue should know she lives in a infinite plane. She should see herself looking in every direction judging by the way she can see the cat.
Edit: just saw the part at 5:00
It’s sad that even for a split second your T-shirt makes me think the video isn’t working lol
It’s really cool to see him at the reflection on the ball
To figure out what shape ur universe is draw some pretty big shapes.
*gets paper draws a triangle big as the paper *
Me , whelp guess its flat
How do they know what a sphere is?
Ali_Army107 for them, a sphere is a 3D version of a curved line in their universe. It is something they cannot imagine for sure, but they can work with mathematically.
Same way we can extrapolate how a 4d shape would behave, by looking the progression of characteristics that dictates the behavior of a 1d shape, how it translates into 2D, then take those 2D and compares to a 3D then finally extrapolates a 4D object. If you own VR set check out "4D toys" or watch a video about 4d objects it is really interesting.
I meant the name.
We have names like hyperplane, tesseract (aka hypercube), pentatope, etc for 4d shapes too if that is closer to what you meant. Another instance for that are irrational numbers which we can name and interact but the actual quantity for them we can never picture in our minds to their full extent.
@@AmaymonF you asked a realy realy genuine question.
This might be the best and my favorite video of yours, this is a concept I always have to come back to from time to time when I forget the details 🤤
But won't she fall off the sphere?? (flat earth logic)
Gravity is everywhere.
The Shape Of A Universe Is
A Shape
Woooow🔥🔥🔥
the universe is conical
@@PsalmWellProduction yeah I know but the shape is infinite stretchable
Actually it is a sphere whose centre is every where. 🤔🤔
your math is beyond my scope, but I can
tell you that the thumbnail is amazing. no joke
the beautifully colored universe touching the
mirrored half globe really does look cool.
WOAH!
I just tried to blow the hair off of my screen because if your profile picture
@@TheActionLab *of
Even me.. 😂
Hahaha
@@TheActionLab I do that like 3 times a day.