I recently watched Carl Sagan's "Cosmos" and I was totally surprised when I realized that in 1980 scientists had not discovered yet clues about the reason of dinosaurs' extinction. Who knows what other discoveries are waiting around the corner. Thank you for going on, John. Your creations are rays of photons during dark times.
It's incredible, how much science has figured out in our lifetimes. It's only really since the 80s that most people had the opportunity to go to college, so we've had an explosion of research in them last 40 years, I think.
Yeah, it's amazing how in my lifetime (I'm 24, for reference) I've seen consensus for how the Dinosaurs died out go from "We're not really sure" to "We're pretty sure it was an asteroid impact."
IIRC in the '80's we had the iridium layer at the K-T boundary and were just starting to get serious about finding the crater. (The Deccan Traps Vs Asteroid impact argument is STILL going)
In my country foreign TV shows are subtitled, not dubbed, so you if you know the original language you are sometimes treated to some real nuggets when the topic is outside the translators knowledge. Among my favorite mistranslations is an exchange from the 1995 low-budget sci-fi show "Space precinct", where in one episode they had discovered a large chunk (say a ton) of antimatter just laying about in the basement of a city building (yup you read that right, scripts and plot devices and stuff, just go with it) and first responders had secured the area and were discussing what to do next. -"Shouldn't we evacuate?" -"Nah, if this this blows, ground zero is the place to be." Translation : "No, if this thing explodes, the safest place to be is on the ground floor." Me: 🤔...😳🤦♂️🤦♂️😂🤣🤣 "Ground zero" didn't become a well-known term until September 2001.
I totally agree.... One Bright energetic flash and it's all over.. Because what will follow afterwards for those who are further away from the impact point will be a slow and painful death.
Please make a video on the (approximately 13,000 years ago) Younger Dryas impacts that created the Carolina bays, the Washington state scab lands, global flooding (which raised sea levels 400 feet) and wiping out 90 percent of the mega fauna, which included Mammoths and Saber tooth Tigers. Thanks.
Randall Carlson is wrong about the scab lands. While there was an asteroid impact in Greenland that corresponds to the Younger Dryas; the scab lands in WA were caused by flooding from glacial lake Missoula.
Was going to post this myself, it's a lot more relatable catastrophe, I think. 65 million years ago, compared to almost recent human history, kind of thing. Gobekli Tepe, e.g. Antonio Zamora here on youtube has done some great videos with calculations of energy per projectile, flight time from the impact site at Saginaw Bay, and lidar images showing the absolute carpet bombing that happened there.
Except Mammoths persisted much later and evidence of their existence as late as 5,000 years ago in mainland Siberia was recently found. This is the not the first time this happened either. There's been quite a few times where groups of animals persisted later than the fossil record originally suggested.
It's been days since you last posted on this channel. I've gotten spoiled over these past few months. I've been checking your JMG channel daily for 4 or 5 days now for new content. Glad to see you posted something tonight! 😊
@@42ZaphodB42 true. And they are active for JMG. BUT.... for JMG content I go by the "trust but verify" method. I trust that youtube will notify me, but I need to verify for myself to see if JMG has uploaded new content! 🤣😂🤣 It's true. 😂 Thanks for the suggestion though. 😊
It's amazing that a meteor, so incredibly tiny compared to the surface area of the object it's hitting, can cause such devastating. It's like a flea killing a brontosaurus.
It is all that kinetic energy plus as Chicxulub has been identified as most likely being a large fragment of a tidally disrupted cometary nucleus it would have hit at incredible speeds in excess of 30km/s. A more appropriate description would be a 50 cal antimaterial round killing an elephant.
Kinda like a bullet. Or the tip of a spear, or the blade of a sword. Large force, applied over a very tiny little pinpoint of surface area. Absolutely REKT.
Man, never considered the idea of an artificial Earth-sourced object smacking into an asteroid and causing a mass extinction. Quite unfortunate the potential microbes on said asteroid's microbiome wouldn't understand the sublime irony of it
I think this might be my favorite channel on the whole youtube, love the topic and your narration style is perfect. Many of these channels gloss over things too quickly, they are exited about the subject but there is no time to reflect and connect the dots. You take the time to carefully and precisely explain things with a great overall view, perfect.
Try watching 'Fall Of Civilisations' channel. You can tell just from the comments on his videos how good it is. It is my, and many others, favourite channel on here and is brilliant, it is a better quality than anyything that is out there on any TV platform worldwide, amazing channel.
I'm new to this channel. I've only seen a few episodes with this one being my fourth. Great content, very informal and scientific. Thank you for all the time and effort put into your videos!
I was just thinking, it is stupid we don't work together as a species to harden our species against extinction. Instead, we threaten each other with it.
@@ElectronFieldPulse 99% of humanity's problems are caused by the 1% who are born psychopaths. I am hoping they have the right brain scans and genetic screening in place to ensure than none of them make it to Mars. But then Mars would face the threat of psychopaths from Earth attacking them in the further future. Sounds like a good theme for a Science Fiction series...
@John Michael Godier , your statement at the beginning of the episode that dinosaurs were already in a decline is very controversial. Many paleontologists will say that they weren't in decline, and that their numbers and variety remained healthy.
John I already know this will be an amazing video!! You sir ALWAYS deliver! You have gotten me thru some tough times with your humor yet educational content.. Standing ovation from me! ~ Sending love from the ~ Pacific Northwest..
My dad was a WWII vet who loved Science fiction. He always thought we got here on earth by accident and didn’t think we belonged on this planet. Part of his theory was that there was a war between aliens and one side threw asteroids at earth. Somehow a few aliens survived the bombardment and injected monkeys with their DNA. He was a great storyteller and your videos remind me of him. Thank you.
I can't wait to see what type of content he starts to create after he watches David LaPoint's RUclips video called " The Primer Fields " . Because, as soon as he sees why Saturn's hexagon is there, he'll be absolutely hooked on Plasma Cosmology. Electromagnetism rules the universe, NOT gravity.
I take a trip to the Yucatán peninsula every summer to visit family, and I’m now realizing after walking that land, how big that meteorite truly was, it’s incredible
Even an icy asteroid could/would be devastating to a modern civilization if it hit the right place. Barely any trace of the meteor remained on the ground, yet it had the power of a nuclear weapon. Just think if the Tunguska asteroid had hit a major European city instead of Siberia.
This is excellent at giving a solid high school level view of the K-T event. If you're interested but have a short attention span (like me) you might have noticed that because he enunciates so clearly, his speech rate is sometimes slower than other similar RUclips videos. At 1.15x playback the pace is much better and still allows total absorption of information.
I have a meteorite from the Barringer Crater or what we call it in AZ Meteor Crater. It’s about the size of a large egg and is all iron. The owners of the property find them when they go out and search the property with metal detectors.
The damage a bullet does to a glass ball could explain what we see on earth. The impact side broke off in a big layer which could explain the age of the Pacific plate, while the shockwaves travelled around the planet and met creating another crater on the opposite side which resembles the Himalayas or the ring of fire
One of the more recent hypotheses about Chixulub still being debated by scientists is that it kicked up such a huge amount of debris that the collective kinetic and frictional energy of all that material reentering Earth's atmosphere at the same time heated it to broiling temperature during the worst of that Very Bad Day. It's not as far-fetched as it sounds: witnesses to both Tunguska and Chelyabinsk reported feeling heat, as well as the air blast. And each of those was only ONE object, not thousands.. Atmosphere temporarily heated to broiling explains hints in the fossil record that all the world's plants caught fire- afterwards there's a period when there's only fern spores, as if everything else was toast. And it explains the oft-repeated claim that no paleontologist has ever discovered any dinosaurs above the iridium line except for birds. And for that matter it seems like nothing larger than a chicken survived aboveground (I read one paper claiming that the birds that made it through were burrowers, although I'm not sure whether that's true. Certainly the mammals were.) TL;DR: add one more nasty possibility to your arsenal of potential asteroid impact hazards: large strikes may be able to loft enough debris to set off a secondary meteor shower which, if it has enough kinetic heat, could raise atmospheric temps to dangerous levels for several hours during the first day of catastrophe. Not yet proven, but I have seen it mentioned in enough NOVA type documentaries and articles on Livescience, Discover, etc that it seems ro be a legit theory (in the layperson's use of the word).
I’m about to listen to this video and fall asleep. Found your channel in December and feel like I should thank you for being my go to channel to fall asleep to. This is easily my favorite currently active channel on this platform.
was listening to this while I made breakfast and accidentally turned the heat up too high. had to restart it so I could pay better attention after I almost turned one side of my sausages into charcoal while the rest would have been raw. you are that relaxing and that interesting.
It is said that we have experienced four smaller events and is shown in Mesoamerica, Egypt, and is depicted in the St. Peter's Basilica as the Delphic Sibyl with four babies holding up the sky. A great book on the subject is The Cosmic Winter by Victor Clube and Bill Napier 1990.
I came across and report recently about a new study of past mass extinctions and impact events. In it, the researchers claim that winters from even very large impactors did not by themselves cause mass extinctions. The mass extinctions happened specifically in cases were albedo-lowering sediments were pulverized in large amount. These led to the impact winter being immediately followed by sudden warming of the climate which in combination overwhelmed the ability of ecosystems to recover, triggering a mass extinctions. Conversely after impact events where no such sediments were thrown up in large quantities, the environment was able to recover from the impact winter without a mass extinction, despite some of these impactors being larger than the ones that did cause mass extinctions. The article did not mention whether factors like acid rain were taken into account, though even if they were not, the relevation that large impacts have occurred without triggering mass extinctions would be significant.
Not a new story. It has been told many times. But in the way jmg does it, it's awesome. Thanks again jmg! I follow your channel for countless years now, i like it and it feels like we all know you.
I totally hope that I can get your books read with your voice, your voice helps me soo much. It makes me feel calm and it helps me go to sleep better than any pills I have been prescribed. God bless your voice and its calming effects
Absolutely _brilliant_ work as always John!!! The music levels were a little low though--that ethereal synth is a real signature of your channel and helps the story-telling no end. I missed it quite a bit. Looking forward to the next entry.
Star Trek voyager had a episode where the crew ran into a advanced species(evolved from dinosaurs) that left earth after that meteor hit and its tech was so far more advanced than Starfleets. It was a very interesting episode
The apparent decline in dinosaur species before the K-Pg extinction event is as far as I know still speculative. The amount of diverse and specialized species right around this time speaks against it.
I'm about to finish your book "The Salvagers" and I've been enjoying it! There's definitely a hint of realism that immerses me, though I'm no physicist. The only minor criticism I can make is dialogue and characters. It's not bad by any means, but it's not something I'll be quoting. Regardless, the world is so well-crafted that it's a minor nuisance!
We made it to another year and still no Asteroid. So I have te chance to write a happy new year to one of my most favorite voices on the internets. You‘ll also rock 24! ✊
Fascinating video series. You mentioned briefly that, if there were advanced civilizations in the Earth's remote past, like intelligent dinosaurs or thecodonts, there might be no record of them, or we could easily miss it. I'd be really interested to hear you expand on that possibility in a future video.
13:00 This sounds like the planetary equivalent of a story that you'd get beers over. "Geez dude, what happened to your planet?" "Well, it was the darndest thing."
John Michael Godier, I have a video idea. What about you do a video about the newly discovered planet in the Proxima Centauri system Proxima Centauri d?
Well, given the fact that dinos had about 150-200 million years to develop intelligence, and still failed, and mammals took only about that 66 million years to develop from a prehistoric mouse to us, it's not clear that dinos would've ever evolved into an intelligent spieces. I'd like to think they would have, but the numbers don't lie.
If we had a perfect simulator or iunno, Futurama's "What if?" machine, how long it'd take for dinosaurs to evolve from having brains the size of a walnut to a human equivalent brain. Also, since dinosaurs were reptiles, can a cold-blooded species even become intelligent?
A fun fact about meteorites and mythology: the ancient Egyptians believed the sky was made of iron because it had the same color as highly polished iron, could withstand the heat of the sun, and occasionally dropped bits of iron to the earth as meteorites.
Really great video! I've seen many videos about impact winter and impact catastrophes, and given its length of only 21min, this is one of the most informative ones I've seen on the topic of what the effects were and would be. Keep it up. Oh, and sure your voice would be great to fall asleep to, if only you wouldn't keep saying such interesting and thought-provoking things that keep my brain running in the dark...
Why don’t we hear about other Iridium layers, as there’ve been many impacts. Or why don’t we see signs of other mass extinctions lining up with other impacts, and mass fires.
Really awesome video, JMG! Thanks! 😃 And well... I'm happy that there's already a mission to try to change the orbit of an asteroid... It's at least a start! Anyway, stay safe there with your family! 🖖😊
The South Pacific volcano explosion gave us an insight into what might happen with an asteroid impact on earth. Multiple shockwaves around the world for hours. Tidal waves that would sweep over continents. Dust and fire filled atmosphere for weeks.
There are several piles of very out of place boulders on Vieques island just off Puerto Rico. Completely different types of rock compared to the local surroundings. Almost reminded me of the large boulders/boulder fields left by glaciers when they melt. Now I'm very curious as to if they were deposited by this event. I need a geologist lol.
The acid rain could have been one reason that the number of species of dinosaurs appeared to be declining before the impact. Bones don't fossilized very well under acid conditions. The best conditions are anoxic mud. Many of the best fossil beds are where animals fell into rivers and were buried in mud.
The impact 68 million years ago appears to have caused the volcanic traps in India. India at that time was an island continent in the middle of what is today the Indian Ocean. India was almost directly opposite to where the asteroid hit in the Yucatan.
Things discussed in a single JMG video: 1. Dinosaurs 2. Spark plugs 3. Thomas Jefferson 4. Iron rain 5. Avocados 6. Vampire bats 7. Mars You won’t find an equally eclectic variety of topics anywhere else.
One of the benefits of industrialised agriculture is that as long as the equipment survives, restarting it from a blank slate might be easier done than expected. You'd have to deal with newly-acidic soils and maybe a shortage of pesticides, but it seems doable. Transport links are similar; short of outright destruction the rail and road networks have a lot of redundancy, and if port facilities aren't washed away they can get straight back to work. Putting the fires out that are caused by a year-long rain of debris is also potentially doable since we have significant capacity for that already. The key would be distributing food adequately for the first year and subsequent decade as everything got back online. It would be staples, maybe even liquified and concentrated, rather than luxuries like chocolate and wine. Still going to see a huge population decline, and poorer countries and regions are going to be hit the hardest. Of course, all this depends on maintaining some sort of high-level order rather than descending into roving bands of looters.
There is a lot of evidence that the younger dryas period (~12000 years ago) that we were hit by multiple 2km asteroids. This would explain the nano-diamonds in the sediment, and the vast temperature swings recorded in the period and the sudden 75% loss of all species. Randolf Carlson and the cosmic tusk websites have more information. Humans were of course around in that period, it is interesting seeing what messages the previous civilisations have for us.
I tend to think of history as being somewhat akin to a strange attractor. Sensitive dependence on initial conditions means that a small change will result in very different states of the system after some time, but it will still be near the attractor. Had Chicxulub not occurred, undoubtedly there would be a very different set of dominant species on Earth now. But I would expect to see similar kinds of ecosystems with similar niches and broadly similar species filling those niches. In much the same way that mammilian carnivores fill the same sorts of niches that theropods once did, or that ungulates fill the same sorts of niches that ceratopsians once did. Perhaps there would be a completely different group of organisms forming herds of grazing herbivores from completely different lineages than we have now that in many ways would appear quite different from ungulates. But there would still be herds of grazing herbivores that share many commonalities with both the species we have now and what existed in the past. As for technological civilizations, I'm inclined to think that there is a large enough factor of random chance in its emergence that it is essentially unpredictable on time scales of a few million or tens of millions of years. So without Chicxulub Earth might now be the home of an ancient civilization wielding Clarkian magic, or maybe we'd still be five million years short of some species starting to consistently make and use stone tools. Somehow I have a sneaking suspicion that the Silurian hypothesis might be more probable than most people seem to think, and perhaps there are still descendants of the dinosaurs living somewhere out in the Milky Way. And they might even be watching us with fascination. That could certainly suggest a plausible reason why an interstellar species would be intensely interested in observing us without making direct contact at this time, a possible variation on the zoo hypothesis.
There is a great deal of disagreement over whether the dinosaurs were in decline at the end of the cretaceous. Some paleontologists species counts show fewer species others show no decline. Considering the disruption in life and the surface of the planet, I tend to think a decline is only the lack of good fossils.
I recently watched Carl Sagan's "Cosmos" and I was totally surprised when I realized that in 1980 scientists had not discovered yet clues about the reason of dinosaurs' extinction. Who knows what other discoveries are waiting around the corner. Thank you for going on, John. Your creations are rays of photons during dark times.
It's incredible, how much science has figured out in our lifetimes.
It's only really since the 80s that most people had the opportunity to go to college, so we've had an explosion of research in them last 40 years, I think.
Calm down
Yeah, it's amazing how in my lifetime (I'm 24, for reference) I've seen consensus for how the Dinosaurs died out go from "We're not really sure" to "We're pretty sure it was an asteroid impact."
They suspected but didn't know about Chicxulub.
IIRC in the '80's we had the iridium layer at the K-T boundary and were just starting to get serious about finding the crater. (The Deccan Traps Vs Asteroid impact argument is STILL going)
A fresh JMG episode always makes the work night worth it....even if it is apocalyptic and horrifying 😂
Preach 🙏
Keep grindin! 🙏🏻
Even
So true
I hit Like during the ad before the video
I think if a massive meteor was going to hit, I’d just get as close to the “vaporization point” as possible and just enjoy the final show. 😂
In my country foreign TV shows are subtitled, not dubbed, so you if you know the original language you are sometimes treated to some real nuggets when the topic is outside the translators knowledge. Among my favorite mistranslations is an exchange from the 1995 low-budget sci-fi show "Space precinct", where in one episode they had discovered a large chunk (say a ton) of antimatter just laying about in the basement of a city building (yup you read that right, scripts and plot devices and stuff, just go with it) and first responders had secured the area and were discussing what to do next.
-"Shouldn't we evacuate?"
-"Nah, if this this blows, ground zero is the place to be."
Translation : "No, if this thing explodes, the safest place to be is on the ground floor."
Me: 🤔...😳🤦♂️🤦♂️😂🤣🤣
"Ground zero" didn't become a well-known term until September 2001.
Same lol
The best view would be from space.
A comfortable chair, a beverage and maybe a fancy hat!
I totally agree.... One Bright energetic flash and it's all over.. Because what will follow afterwards for those who are further away from the impact point will be a slow and painful death.
Please make a video on the (approximately 13,000 years ago) Younger Dryas impacts that created the Carolina bays, the Washington state scab lands, global flooding (which raised sea levels 400 feet) and wiping out 90 percent of the mega fauna, which included Mammoths and Saber tooth Tigers. Thanks.
Randall Carlson is wrong about the scab lands. While there was an asteroid impact in Greenland that corresponds to the Younger Dryas; the scab lands in WA were caused by flooding from glacial lake Missoula.
Was going to post this myself, it's a lot more relatable catastrophe, I think. 65 million years ago, compared to almost recent human history, kind of thing. Gobekli Tepe, e.g. Antonio Zamora here on youtube has done some great videos with calculations of energy per projectile, flight time from the impact site at Saginaw Bay, and lidar images showing the absolute carpet bombing that happened there.
@@zachjones6944 carlson will be proven right in the end
Except Mammoths persisted much later and evidence of their existence as late as 5,000 years ago in mainland Siberia was recently found. This is the not the first time this happened either. There's been quite a few times where groups of animals persisted later than the fossil record originally suggested.
We need more 20-30 min videos from you. I absolutely love astronomy, early earth history, extinction events etc.
It's been days since you last posted on this channel. I've gotten spoiled over these past few months. I've been checking your JMG channel daily for 4 or 5 days now for new content. Glad to see you posted something tonight! 😊
Or you could just activate notifications and the checking does itself. Just a suggestion 👍
@@42ZaphodB42 true. And they are active for JMG.
BUT.... for JMG content I go by the "trust but verify" method.
I trust that youtube will notify me, but I need to verify for myself to see if JMG has uploaded new content! 🤣😂🤣
It's true. 😂
Thanks for the suggestion though. 😊
It's amazing that a meteor, so incredibly tiny compared to the surface area of the object it's hitting, can cause such devastating. It's like a flea killing a brontosaurus.
It is all that kinetic energy plus as Chicxulub has been identified as most likely being a large fragment of a tidally disrupted cometary nucleus it would have hit at incredible speeds in excess of 30km/s.
A more appropriate description would be a 50 cal antimaterial round killing an elephant.
Kinda like a bullet.
Or the tip of a spear, or the blade of a sword.
Large force, applied over a very tiny little pinpoint of surface area.
Absolutely REKT.
@@Dragrath1 how has it been identified as a cometary fragment.
A flea going hundreds of times faster than a bullet
Goes to show how delicate the balance of conditions that is necessary for life to be maintained on Earth.
Man, never considered the idea of an artificial Earth-sourced object smacking into an asteroid and causing a mass extinction. Quite unfortunate the potential microbes on said asteroid's microbiome wouldn't understand the sublime irony of it
I think this might be my favorite channel on the whole youtube, love the topic and your narration style is perfect. Many of these channels gloss over things too quickly, they are exited about the subject but there is no time to reflect and connect the dots. You take the time to carefully and precisely explain things with a great overall view, perfect.
Try watching 'Fall Of Civilisations' channel.
You can tell just from the comments on his videos how good it is.
It is my, and many others, favourite channel on here and is brilliant, it is a better quality than anyything that is out there on any TV platform worldwide, amazing channel.
I'm new to this channel. I've only seen a few episodes with this one being my fourth. Great content, very informal and scientific. Thank you for all the time and effort put into your videos!
Welcome to the planet on which we liiive. 👍❤️
I finally ordered your book from Amazon. Can't wait!
Very good episode. It has been a stressful day and this made a very good bedtime story. Thank you.
PS - I liked your book.
This is why we need to work toward running our cities as if they were huge self sufficient space ships sitting on the surface of Earth.
I was just thinking, it is stupid we don't work together as a species to harden our species against extinction. Instead, we threaten each other with it.
Then run for Mayor of your city using that platform. You will go far, I'm sure.
@@ElectronFieldPulse #endtribalism
@@ElectronFieldPulse 99% of humanity's problems are caused by the 1% who are born psychopaths. I am hoping they have the right brain scans and genetic screening in place to ensure than none of them make it to Mars. But then Mars would face the threat of psychopaths from Earth attacking them in the further future. Sounds like a good theme for a Science Fiction series...
@@ElectronFieldPulse
Right!!!!?????
It's mind boggling to me!
Just be kind!
Seems so out of reach for most ppl..
🤦
@John Michael Godier , your statement at the beginning of the episode that dinosaurs were already in a decline is very controversial. Many paleontologists will say that they weren't in decline, and that their numbers and variety remained healthy.
John I already know this will be an amazing video!!
You sir ALWAYS deliver!
You have gotten me thru some tough times with your humor yet educational content..
Standing ovation from me!
~ Sending love from the
~ Pacific Northwest..
My dad was a WWII vet who loved Science fiction. He always thought we got here on earth by accident and didn’t think we belonged on this planet. Part of his theory was that there was a war between aliens and one side threw asteroids at earth. Somehow a few aliens survived the bombardment and injected monkeys with their DNA. He was a great storyteller and your videos remind me of him. Thank you.
Imagine if there were other human species in space. Or something
Great episode John I love that you're making longer videos now! Thanks, hope you're doing well. :)
I can't wait to see what type of content he starts to create after he watches David LaPoint's RUclips video called " The Primer Fields " . Because, as soon as he sees why Saturn's hexagon is there, he'll be absolutely hooked on Plasma Cosmology. Electromagnetism rules the universe, NOT gravity.
I knew ground sloths were the avocado toast eating cappuccino drinking coastal elites.
You left off your Mom.
I take a trip to the Yucatán peninsula every summer to visit family, and I’m now realizing after walking that land, how big that meteorite truly was, it’s incredible
Even an icy asteroid could/would be devastating to a modern civilization if it hit the right place. Barely any trace of the meteor remained on the ground, yet it had the power of a nuclear weapon. Just think if the Tunguska asteroid had hit a major European city instead of Siberia.
This is excellent at giving a solid high school level view of the K-T event. If you're interested but have a short attention span (like me) you might have noticed that because he enunciates so clearly, his speech rate is sometimes slower than other similar RUclips videos. At 1.15x playback the pace is much better and still allows total absorption of information.
At 40 minutes since upload this video has more views than seconds it's been available. You're awesome JMG
Yay! Thank you for immediately acknowledging that birds are dinosaurs.
I rarely learn anything now. That’s 2 videos in a row where I have learned something. What a great feeling. 🙏🏻👍🏻
I have a meteorite from the Barringer Crater or what we call it in AZ Meteor Crater. It’s about the size of a large egg and is all iron. The owners of the property find them when they go out and search the property with metal detectors.
Another awesome upload JMG! Thank you for everything!
John Michael Godier, you know so much about space and time, just keep on doing it bro!
The damage a bullet does to a glass ball could explain what we see on earth.
The impact side broke off in a big layer which could explain the age of the Pacific plate, while the shockwaves travelled around the planet and met creating another crater on the opposite side which resembles the Himalayas or the ring of fire
i ran an RPG capaign years ago, where sentient dinosaurs, flleing an iridium weapon war, travelled uptime, and the PCs had to stop their incursions
One of the more recent hypotheses about Chixulub still being debated by scientists is that it kicked up such a huge amount of debris that the collective kinetic and frictional energy of all that material reentering Earth's atmosphere at the same time heated it to broiling temperature during the worst of that Very Bad Day.
It's not as far-fetched as it sounds: witnesses to both Tunguska and Chelyabinsk reported feeling heat, as well as the air blast. And each of those was only ONE object, not thousands..
Atmosphere temporarily heated to broiling explains hints in the fossil record that all the world's plants caught fire- afterwards there's a period when there's only fern spores, as if everything else was toast. And it explains the oft-repeated claim that no paleontologist has ever discovered any dinosaurs above the iridium line except for birds. And for that matter it seems like nothing larger than a chicken survived aboveground (I read one paper claiming that the birds that made it through were burrowers, although I'm not sure whether that's true. Certainly the mammals were.)
TL;DR: add one more nasty possibility to your arsenal of potential asteroid impact hazards: large strikes may be able to loft enough debris to set off a secondary meteor shower which, if it has enough kinetic heat, could raise atmospheric temps to dangerous levels for several hours during the first day of catastrophe. Not yet proven, but I have seen it mentioned in enough NOVA type documentaries and articles on Livescience, Discover, etc that it seems ro be a legit theory (in the layperson's use of the word).
I’m about to listen to this video and fall asleep. Found your channel in December and feel like I should thank you for being my go to channel to fall asleep to. This is easily my favorite currently active channel on this platform.
was listening to this while I made breakfast and accidentally turned the heat up too high. had to restart it so I could pay better attention after I almost turned one side of my sausages into charcoal while the rest would have been raw. you are that relaxing and that interesting.
It is said that we have experienced four smaller events and is shown in Mesoamerica, Egypt, and is depicted in the St. Peter's Basilica as the Delphic Sibyl with four babies holding up the sky. A great book on the subject is The Cosmic Winter by Victor Clube and Bill Napier 1990.
JMG when are we getting an audiobook of Supermind?
I came across and report recently about a new study of past mass extinctions and impact events. In it, the researchers claim that winters from even very large impactors did not by themselves cause mass extinctions. The mass extinctions happened specifically in cases were albedo-lowering sediments were pulverized in large amount. These led to the impact winter being immediately followed by sudden warming of the climate which in combination overwhelmed the ability of ecosystems to recover, triggering a mass extinctions.
Conversely after impact events where no such sediments were thrown up in large quantities, the environment was able to recover from the impact winter without a mass extinction, despite some of these impactors being larger than the ones that did cause mass extinctions.
The article did not mention whether factors like acid rain were taken into account, though even if they were not, the relevation that large impacts have occurred without triggering mass extinctions would be significant.
Not a new story. It has been told many times. But in the way jmg does it, it's awesome. Thanks again jmg! I follow your channel for countless years now, i like it and it feels like we all know you.
Thank you for another intriguing episode JMG. I always look forward to seeing the notification of a new video.
I totally hope that I can get your books read with your voice, your voice helps me soo much. It makes me feel calm and it helps me go to sleep better than any pills I have been prescribed. God bless your voice and its calming effects
Absolutely _brilliant_ work as always John!!! The music levels were a little low though--that ethereal synth is a real signature of your channel and helps the story-telling no end. I missed it quite a bit.
Looking forward to the next entry.
I agree personally but I think it strikes a balance between those who prefer to have the music and those who don't
Dumbass comment
I thought the music levels were a little high. His voice is the best music.
Too LOUD if anything.
@@DanCooper404 Didn't he say he was going to release two versions of his material in future--one that had a backing track and one that didn't?
Star Trek voyager had a episode where the crew ran into a advanced species(evolved from dinosaurs) that left earth after that meteor hit and its tech was so far more advanced than Starfleets. It was a very interesting episode
Put the bottle down son.....
@@0scartheCat s03e23 Distant Origin
The apparent decline in dinosaur species before the K-Pg extinction event is as far as I know still speculative.
The amount of diverse and specialized species right around this time speaks against it.
Been waiting for a new video! Thanks JMG!
ah a winter video, very seasonal! all ready for some ash-man building
😂😂😂
I must be tired cuz it took me a millisecond to get it.. 😄
Good one 😉
I'm about to finish your book "The Salvagers" and I've been enjoying it! There's definitely a hint of realism that immerses me, though I'm no physicist.
The only minor criticism I can make is dialogue and characters. It's not bad by any means, but it's not something I'll be quoting. Regardless, the world is so well-crafted that it's a minor nuisance!
We made it to another year and still no Asteroid. So I have te chance to write a happy new year to one of my most favorite voices on the internets. You‘ll also rock 24! ✊
Excelente video John. Gracias por divulgar ciencia a traves de este medio.
Fascinating video series. You mentioned briefly that, if there were advanced civilizations in the Earth's remote past, like intelligent dinosaurs or thecodonts, there might be no record of them, or we could easily miss it. I'd be really interested to hear you expand on that possibility in a future video.
"Extinction through vaporization" should be a band.
"Bird! Don't you call me no friggin' bird!", said the cassowary, as it disemboweled you with it's medial claw.
Nice video.
Love your videos man, always appreciate the uploads!
13:00
This sounds like the planetary equivalent of a story that you'd get beers over.
"Geez dude, what happened to your planet?"
"Well, it was the darndest thing."
John Michael Godier, I have a video idea. What about you do a video about the newly discovered planet in the Proxima Centauri system Proxima Centauri d?
Always a highlight to see a new vid pop up. Thank you.
As to your last question about the dinosaurs, there was an interesting episode of Star Trek: Voyager regarding that deals with it.
Hate to tell ya that it’s absolute bullshit. Cmon. You’re talking about Star Trek? Ridiculous.
what's the name of the episode?
@@jjbeatle2006 Distant Origin
Interesting as usual
Well, given the fact that dinos had about 150-200 million years to develop intelligence, and still failed, and mammals took only about that 66 million years to develop from a prehistoric mouse to us, it's not clear that dinos would've ever evolved into an intelligent spieces. I'd like to think they would have, but the numbers don't lie.
Well birds are immensely intelligent, I wonder if the surviving the KT extinction selected for intelligence in some species.
Maybe they did, multiple times? How would we know?
If we had a perfect simulator or iunno, Futurama's "What if?" machine, how long it'd take for dinosaurs to evolve from having brains the size of a walnut to a human equivalent brain. Also, since dinosaurs were reptiles, can a cold-blooded species even become intelligent?
“On average we’re not overdue for another 100 million year asteroid anytime soon.” Me has flashbacks of missing several 90% in xcom.
Love your videos man.
A fun fact about meteorites and mythology: the ancient Egyptians believed the sky was made of iron because it had the same color as highly polished iron, could withstand the heat of the sun, and occasionally dropped bits of iron to the earth as meteorites.
Just boosting this legends algorythm
Nicely presented and quality audio, thanks!
Really great video! I've seen many videos about impact winter and impact catastrophes, and given its length of only 21min, this is one of the most informative ones I've seen on the topic of what the effects were and would be. Keep it up.
Oh, and sure your voice would be great to fall asleep to, if only you wouldn't keep saying such interesting and thought-provoking things that keep my brain running in the dark...
JMG: 'Something caused the extinction of the dinosaurs"
Avi Loeb: "Ancient Aliens"
Best channel on RUclips
Listening to this while watching meteors and jupiter love this challenge
Thank you for another addition to the spooky playlist :)
19:00. That'd be a chad move. Like mugging the mugger. Ah, humanity...
If an asteroid ever does hit Earth I hope it hits my house.
Straight up!
Same here. I don’t want to be around after.
🤣🤣😂
I hope it hits your house too. ))
I hope you live next to Biden.
Why don’t we hear about other Iridium layers, as there’ve been many impacts. Or why don’t we see signs of other mass extinctions lining up with other impacts, and mass fires.
When I was younger I used to enjoy watching meteor showers, now I hold my breath a little during peak days.
Really awesome video, JMG! Thanks! 😃
And well... I'm happy that there's already a mission to try to change the orbit of an asteroid... It's at least a start!
Anyway, stay safe there with your family! 🖖😊
nuking it still seems the best solution
Excellent as always good sir! Keep ‘em coming
JMG is back at it baby with another banger! Turn it up! Turn it up! Turn it up! 🔥💪🔊
“How do we restart civilization?”
Kind of you to assume it started in the first place.🤠
It has happened before. It will happen again. The only question is when?
Tomorrow.
Bought a Tektite teardrop last year.. it is one of the most awe inspiring objects I've ever held
The South Pacific volcano explosion gave us an insight into what might happen with an asteroid impact on earth. Multiple shockwaves around the world for hours. Tidal waves that would sweep over continents. Dust and fire filled atmosphere for weeks.
With an ocean impact that large, what effect would there be on global sea levels?
This really cheered me up 🤔😂
Calm yourself.
There are several piles of very out of place boulders on Vieques island just off Puerto Rico. Completely different types of rock compared to the local surroundings. Almost reminded me of the large boulders/boulder fields left by glaciers when they melt. Now I'm very curious as to if they were deposited by this event. I need a geologist lol.
The acid rain could have been one reason that the number of species of dinosaurs appeared to be declining before the impact. Bones don't fossilized very well under acid conditions. The best conditions are anoxic mud. Many of the best fossil beds are where animals fell into rivers and were buried in mud.
I did not know birds as we know them existed alongside dinosaurs.
Not as we know them...
They are that shit we see flying in the skies.
That was excellent and very entertaining, you just earned a new subscriber, thankyou for making a lousy day a lot better
“Earned” a new subscriber. Wow thanks for gracing him with your excellence.
"The amazing universe in which we liiiiiiiiiiiiiiiiiiiiiiiive"
love it
The impact 68 million years ago appears to have caused the volcanic traps in India. India at that time was an island continent in the middle of what is today the Indian Ocean. India was almost directly opposite to where the asteroid hit in the Yucatan.
Things discussed in a single JMG video:
1. Dinosaurs
2. Spark plugs
3. Thomas Jefferson
4. Iron rain
5. Avocados
6. Vampire bats
7. Mars
You won’t find an equally eclectic variety of topics anywhere else.
Thumbs for John's new video and then ill watch it👍
Impact Winter, Volcanic Winter and Nuclear Winter are no joke! Good things is, two of those can be actively prevented.
1:27 so your trying to tell me T-rex tastes like chicken?
Man, bringing them back to life and hunting them would be wild..
Fascinating presentation thanks xxx. Jim Hensons " Dinosaurs " may answer your last question!
One of the benefits of industrialised agriculture is that as long as the equipment survives, restarting it from a blank slate might be easier done than expected. You'd have to deal with newly-acidic soils and maybe a shortage of pesticides, but it seems doable. Transport links are similar; short of outright destruction the rail and road networks have a lot of redundancy, and if port facilities aren't washed away they can get straight back to work. Putting the fires out that are caused by a year-long rain of debris is also potentially doable since we have significant capacity for that already.
The key would be distributing food adequately for the first year and subsequent decade as everything got back online. It would be staples, maybe even liquified and concentrated, rather than luxuries like chocolate and wine. Still going to see a huge population decline, and poorer countries and regions are going to be hit the hardest.
Of course, all this depends on maintaining some sort of high-level order rather than descending into roving bands of looters.
There is a lot of evidence that the younger dryas period (~12000 years ago) that we were hit by multiple 2km asteroids. This would explain the nano-diamonds in the sediment, and the vast temperature swings recorded in the period and the sudden 75% loss of all species.
Randolf Carlson and the cosmic tusk websites have more information.
Humans were of course around in that period, it is interesting seeing what messages the previous civilisations have for us.
I tend to think of history as being somewhat akin to a strange attractor. Sensitive dependence on initial conditions means that a small change will result in very different states of the system after some time, but it will still be near the attractor. Had Chicxulub not occurred, undoubtedly there would be a very different set of dominant species on Earth now. But I would expect to see similar kinds of ecosystems with similar niches and broadly similar species filling those niches. In much the same way that mammilian carnivores fill the same sorts of niches that theropods once did, or that ungulates fill the same sorts of niches that ceratopsians once did. Perhaps there would be a completely different group of organisms forming herds of grazing herbivores from completely different lineages than we have now that in many ways would appear quite different from ungulates. But there would still be herds of grazing herbivores that share many commonalities with both the species we have now and what existed in the past.
As for technological civilizations, I'm inclined to think that there is a large enough factor of random chance in its emergence that it is essentially unpredictable on time scales of a few million or tens of millions of years. So without Chicxulub Earth might now be the home of an ancient civilization wielding Clarkian magic, or maybe we'd still be five million years short of some species starting to consistently make and use stone tools.
Somehow I have a sneaking suspicion that the Silurian hypothesis might be more probable than most people seem to think, and perhaps there are still descendants of the dinosaurs living somewhere out in the Milky Way. And they might even be watching us with fascination. That could certainly suggest a plausible reason why an interstellar species would be intensely interested in observing us without making direct contact at this time, a possible variation on the zoo hypothesis.
Question I can only wildguess: how old could one fully grown Tyranasaurus live? 50, 100, 500, 1000 years?
Excellent video. Can’t wait for more James web videos as well. 👍🏻
There is a great deal of disagreement over whether the dinosaurs were in decline at the end of the cretaceous. Some paleontologists species counts show fewer species others show no decline. Considering the disruption in life and the surface of the planet, I tend to think a decline is only the lack of good fossils.
Do you think the government would tell us if a asteroid was on its way?
Or is it too hard to hide i.e astrologists all over the world
Btw, wasn't there a major volcanic eruption at about the antipodal point to the Chicxulub impact, at around that same time period?
16:42 There's a problem with this take: WE have driven the megafauna to extinction. Had we not done that, avocado wouldn't be endangered.