China, Five Degrees, One Hundred Fifty Kilometers discussed on The Science Show

The Science Show
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The spectacular dinosaur graveyard in northeastern china where these entire ecosystems of dinosaurs were buried by volcanoes almost palm paste to hell so you had these dinosaurs preserved as fossils going about their everyday business and they were buried so quickly that the feathers even preserved and there are two tyrannosaur species from these ancient volcanoes that are covered in feathers so that's a really good sign that t rex probably had some kind of feather two so t rex wasn't frightening enough just imagine it as this double decker bus sized big bird from hell the real t rex and not flying so presumably the feathers with sums would have temperature control that's right so t rex was far too big to fly it was like a blimp than an airplane couldn't actually slapped it's tiny little arms to get up in the air and so a lot of dinosaurs were like that too a lot of dinosaurs had feathers but they were too big to fly or they didn't have big enough arms to support themselves in the air and so these feathers were probably there to keep those dinosaurs war they probably evolved for insulation similar to mammals evolved hair but then later on one group of dinosaurs velociraptor they got smaller and smaller their feathers started to elaborate their arms got longer they developed wings and then they developed the ability to fly and that's ramadhan birds came from a lush dinosaur still living sixty five million years ago there was this impact which you described so shocked extraorde i i see that seventy percent of the creatures will wiped out that is the dinosaurs and plenty of others as well but in some books it looks as if they lingered for quite a long time thousands of years anyway is that true yeah we're learning more and more about that extinction is like so many things about dinosaurs are just so many people around the world looking for new fossils right now and also studying the rocks as well that we're just learning a lot more about all aspects of dinosaur life dinosaur history but especially the extinction there's some really exciting new research has just been public about the extinction this new study just come out shows that temperature increased by five degrees global temperature five degrees within the first hundred thousand years after the asteroid hit so there was a lot of chaos right after that asteroid hit this thing was traveling faster than a jetliner was ten kilometers across at hit the earth with the force of over a billion her rochambeau bombs punched crater her in the cross more than one hundred fifty kilometers wide this was a really really big asteroid and it looks like it did most of his damage right away so probably most dinosaurs died out really quickly we're talking about hours days weeks months some might of staggered on and birds made it through we can't forget about birds but the other dinosaurs at least some probably saying around bit but what we do know is by ten thousand years after the asteroid hit the dinosaurs were gone because we have really good fossils that are dated really well from western north america and there are no dinosaur at all not even a single tooth but instead you have a bunch of teeth and jaws of the creatures took over from the dinosaurs the mammals and so the dinosaur fall was a sudden fall they were an empire for one hundred and fifty million years and then really they fell in a day and i think that's a really really sobering on cyber indeed steeper seti in his book the rise and fall of the dinosaurs he's truly marvellous production for the science by david fisher and hamish leery i'm robin williams

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