Cepheid Variable Stars and Distance Measurement in Space - Space Engine
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- Опубликовано: 27 авг 2024
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Hello and welcome to What Da Math!
In this video, we will talk about the Cepheid Variable Stars and how we measure distances to various far objects in our universe.
Learn more by watching the video.
Enjoy and please subscribe.
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Thank you, wonderful person. I actually understand for the first time how we calculate distance from cepheids.
UNANSWERED QUESTIONS IN THIS VIDEO: Why is there a linear relationship between period and luminosity? Why aren't some non-linear? What causes the variable brightness in these stars?
When ever people talk about cephids they always leave out that detail and that is the most important part.
Finally beginning to understand this variable star thing. Thanks
You didn't explain how Henrietta calculated original brightness. You just said she did and that could be plugged into your equation to calculate distance. The thought that went into her discovery and the math behind it is what is interesting. Once again Henrietta's genius was not appreciated sufficiently but this time by you! Tsk tsk tsk!
That detail is always left out when explaining these standard candles.
Thanks Anton, this explained it well
Thank you very useful for my project
I ordered Kim Jong-un to create variable stars so Anton could talk about it.
Very interesting. One socio/political note; while Henrietta Levett worked for very little money (.30 per hour), she was a woman of independent means and worked for Pickering, at first, as a volunteer. Though she was not recognized for her achievements during her lifetime - she was nominated for a Nobel Prize four years after her death by a member of the Swedish Academy of Science who didn't know she had died, prematurely, of various medical complications. Lastly, you make it seem as though Pickering was simply, out of mean-spiritedness or chauvinism, keeping Henrietta from looking through the telescope from which the plates she was examining were taken. I'm sure he'd have been happy to give her a peek had that particular telescope not been located at Harvard's Boyce station in Peru.
As for Pickering, this from Wikipedia's entry on Annie Jump Cannon, Levett's equally remarkable co-worker: "In 1896, Cannon became a member of "Pickering’s Women",[13] a group of women hired by Harvard Observatory director Edward C. Pickering to complete the Henry Draper Catalogue, with the goal of mapping and defining every star in the sky to a photographic magnitude of about 9.[14] In her notes, she referred to brightness as "Int" which was short for "intensity".[15] Pickering said that she was able to classify stars quickly, "Miss Cannon is the only person in the world-man or woman-who can do this work so quickly."[16] Hardly the quote of a man you portray as unlikeable and unappreciative. Also, contrary to your statement, he did pay the women. In fact, thanks to a support fund set up by Anna Draper, he paid them - 80 of them! - five cents more per hour than the 25 cent average. I doubt that any of these women considered themselves mistreated, as you aver. I think you owe Mr. Pickering's legacy an apology, retraction, and correction.
Just a suggestion that you confine your videos to conveying scientific information rather than social commentary, which is clearly not your forte.
Hi anton i am a big fan. you are one of the people who inspired me to
make videos. can you tour the Kuiper Belt in space engine? and thanks
for the awesome content
sup Pluto
Sup
thank you and good luck!
Thx for explaining it so well.
Great video 👍 You should read the “Glass Universe”, by Dana Sobel. it’s about the woman computers you mention. Heads up Edward Pickering wasn’t that bad 👍
What is this cool app called the one you are using?
Space engine
Thank you !!
i love space!!!
Can someone explain why the Gravity (which causes the collapse of star) doesn't change in intensity?
[E.g. Why wouldn't gravity 'slows/reduce' when the mass of stars become smaller? Isn't gravity proportionate to mass?.]
Genuinely curious. Please answer this question! Thanks!
The mass of the star doesn't significantly change when it collapses. It's just that all the empty space between electrons and protons in its matter, empty space which makes up like 99% of an atom, is compressed to the point where the positive and negative combine and form a neutron. The mass is still there, just in a much smaller space backed more densely.
Hello everyone? Not wonderful person?
You do not address me as “everyone”. I am “Wonderful Person”.
You uploaded this yesterday. It was my birthday :p
Today's my birthday
dad is that you?
happy belated birthday!
happy belated birthday!
good job I like it (:
Will you ever do a video on the Boötes Void?
if I find a way to simulate it yes. it's impossible in space engine as of now
Please can you do a universe sandbox episode where you do stuff with 100% water planets?
Which software(app) are u using?
M Ahmad S please see the video description.
nvm
my theory on the "end" of the universe is that, infact, there are stars past that point, they are just a lot younger, confusing i know, i'll explain if anyone replies to this.
Please explain.
You can zoom in like a telescope by hiding down page up
Holding**
The good old days
Is he using Gaia’s 3D map?
Can you do a video on your top 5 favorite space simulators?
I did one a few months back. the free ones at least
Thats the nearest galaxy not andromeda
Please can you make a detailed video that simulates catastrophic global warming. Please do a slow simulation of what happens to Earth if all the ice in the world melts. That includes the complete melting of the Arctic, Greenland and Antarctica. Thank you.
I believe he did that by increasing the carbon dioxide of earth in a video
You did increase the level of carbon dioxide, but you did not simulate the slow motion rise in sea level. Please make a video that simulates the slow motion rise in sea level of all the ice on Earth melting.
@@CesareVesdani Drink more water!
Can you make a video about why mars has no water anymore
maybe cepheid variable stars have a brighter and a darker side
Just like earth
Is there a south star , can you tell me the name?
No, but a good way to find the celestial south pole is a neat trick with the "crux" constellation (southern cross).
1. Find the southern cross, and locate its two primary stars that run lengthwise, keep those in mind.
2. Find the two 'pointers' that point towards the southern cross.
3. Draw an imaginary line between the pointers, and find the midpoint of that line.
4. Extend a perpendicular line from that midpoint such that it intersects with a line extended from the two primary stars in the southern cross.
5. This intersection is the celestial south pole!
It may be a little more difficult that simply identifying the north star, but it's possible.
Awesome video - thanks for posting. I love your recognition of women also - thumbs up from me!
Bit like Herschel and his sister :(
when a girl can talk astronomy, I'm like
You are very wrong about Pickering, the real story is opposite to what you described - he was the first to let women into science work in Harvard and promoting them.
I wish you had like a two min version
Guys should I get Comcast?
Can you get Verizon? Always go with Verizon Fios over Xfinity if you can.
+Dst Rich8 Thad what I was thinking they said I had to call them
Dst Rich8 I just realized its not here in my area. sad it looked so great too!
Zdt 71 same situation in my area, it's painfully obvious Comcast pays them off so they don't build here
+Dst Rich8 Fios should grow its sorta like google fiber
You have lied about the intentions and motivations of Edward Pickering to employ women in the field of astronomy. You are viewing his actions through a 21st century leftist, feminist lens and therefore slandered a man who advanced the field of astronomy while recognizing the ability of those women who were partial to astronomy to contribute to the field. Many people, both male and female today will work for free or for low wages to gain entry or experience in a desirable field. Your presentist bias is showing. Pickering was certainly not lazy but you are for not looking past the glib MSM feminist narrative.
Changing the exposure once or twice, OK maybe 3x, sure... But seriously man. You don't have to do it every 5-10 seconds. It's not what "exposure" is meant for. I just had to stop 6 minutes in the video because it just started to piss me off. Sorry, because the explanation was quite interesting.
3:45 it's called division of labor - a good capitalistic idea - frond down upon now days because everyone a big shot - thanks to capitalism.
And Mao's exploitation for workers led to very rapid development of China's infrastructure...only because something is useful afterwards it doesn't make disappear it's trade-offs ya know. Tell your one-sided glorification of division of labor to factory workers in london around the year 1900. That was also division of labor. It's not that easy.
44th
Nice video
Beautiful lady henrietta
Didn't women work as calculators in many Universitys and laboratories throughout the Western World at the time? I would imagine many of them were proud of the fact that their math skills were probably insane and took great pride in the discoveries they were able to take part in. They also played a large role in helping us to win World war II doing exactly this. Maybe I'm wrong and he beat or rape them which is always a possibility but just the fact that they were the ones who did the math does not seem like a reason to chastise him. Please correct me if I am mistaken.
Lol, probably should have watched the whole video before commenting. It's nothing Edison didn't do though but it's definitely wrong.
I invented a process where I use type 1A supernova which is a known candle to measure distance from Galaxy to Galaxy and in California some jew posing as an astronomer stole process
Wow. A lot of assumptions and disparaging remarks.
instead of talking so much, you could have a shown a clear example of how the calculation was done.
He would still have to talk to carry out the calculations and justify them in the viewer's mind.
Cool video, but I'm getting white knight vibes from you. They are not good vibes.