Tunguska, Chicxulub, and Chelyabinsk

8:25happened in human recorded history. 1908 was the Tungaska event in Siberia. It was a 50 to 80 m object and it burst 10 m above the surface. So it didn't even make contact with the earth. It exploded because it was heated up by so much. Um and it flattened 30 million trees over hundreds of kilome squared. >> Fortunately, it was in the middle of nowhere in Siberia, right? But imagine if that happened on a population center. >> Yeah. >> It would be way way worse than Hiroshima Nagasaki, right? Yes. Um, in 1980 there was the Alvarez hypothesis which was linking the Cretaceous Paleogene extinction which is the extinction of

9:06the dinosaurs 66 million years ago. Um, it linked that to a cosmic impact. In 1991, the Chickix Club crater was discovered in the Yucatan Peninsula because a bunch of >> oil companies were charting the gravity, the specific gravity around the Yucatan Peninsula looking for oil. Interesting, right? And so, in order to look for oil, what you want to look for is like low density packets >> under the Earth's crust. And one of the best ways to do that is to literally just measure the acceleration due to gravity. The thing that we learn in high school being 9.8 meters/s squared. Well, if you go 9.8 one, you know, all of the

9:48little digits, the little tiny deviations of that acceleration due to gravity. If it's a little less than normal here versus somewhere else, that could mean that there's a low density packet underneath the ground, which is why it's not pulling on whatever object, >> right, >> that you're using to measure that acceleration. So, oil companies were doing that. They actually found a ring of high density. M. Oh, >> and that ring was the size of the Yucatan Peninsula and it was this primordial crater from 66 million years ago. >> I have one clarifying question. When you when you mentioned like low density pocket, >> what you're referring to is like a a lake of oil under the ground. >> Exactly. Okay. Yeah. Yeah. Instead of rock.

10:28>> Instead of rock. Cuz the the oil is less dense than rock. And so what they're looking for is an underground lake of oil. >> Exactly. Yeah. And that underground lake of oil would decrease the effect of gravity in that location. So if you were to measure gravity very very precisely, you'd be able to chart out where the oil is. >> That makes sense. This is also why science is so important to capitalism. Yeah. Because the alpha matters. >> The alpha matters and and like and like the the you know the the closer you get to this precision, >> the more you can unlock, you know. Mhm. >> Um and then finally in 2013 there was the um Chelins Meteor which was a 20 m object over a thousand injuries happened also over

11:09Russia. >> Yes. >> Um this and this was one that was very there was video like you know it was very because we had media and technology devices. It's probably the most prominent >> uh atmospheric large object atmospheric breakup explosion. >> Yeah. >> And you know over a thousand I mean it was a lot. It was >> it was a lot. It was a lot a lot of broken windows and things like that. Um one of the reasons why we have so much footage on that is because Russians >> the Russians love having dash cams. >> Yeah. Yeah. >> Because I don't know. I mean I don't want to say anything. comment in the in the in the thread if you know the reason why that's true. >> Yeah. Yeah. But anyways, Russians love having dash cams and so there's so much

11:51dash cam footage of the meteor just like coming down, right? It's it's pretty incredible. >> I want to just re-emphasize that that 2013 meteor was only 20 m