Aired 6 years ago on Dark Matter Digital 

Graham Hancock: Cosmic Cataclysms Of The Past And Their Relevance To Us Today

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It used to be held that the last time we had a major, what they call a cosmic cataclysm on this planet was 65 million years ago. - Dinosaurs. - Dinosaurs, what they call the KT event when was is calculated to be an asteroid about 10 kilometers in diameter, smacked into the Earth, in the gulf of Mexico, created a global firestorm, destabilized the crust of the Earth, sent huge plumes of volcanic smoke rising into the upper atmosphere, changed the climate completely and in the process rendered extinct the dinosaurs that had been the masters of our planet for hundreds of millions of years, before that. Now the view of science was that impacts of this scale was, what you call extinction level events, are very rare, but they happen approximately once every hundred million years, although how anyone could seriously expect the universe to be as predictable as that I cannot imagine like every hundred million years the alarm clock rings, but this was the view and that while it was known that the Earth is in the path of small objects, meteorites, that they enter our skies all the time, little shooting stars, they light up, very pretty to look at, we don't feel endangered by these, they're the size of a speck of dust and they're not going to do any harm to the Earth, so historians looking at the story of human civilization, anatomically modern humans like us, at least according to the mainstream view are supposed to have existed for only the last 200,000 years and civilization according to the mainstream view is only supposed to be about 5,000 years old, so if you're dealing with time spans of 200,000 years or 5,000 years, why need you concern yourself with time spans of hundreds of millions of years? This is the essential point of history so history doesn't take account of cosmic cataclysms, and that's why with this rigid view that the last one happened 65 million years ago, that we're not going to see another cataclysm for about another 35 million years, that's why history ignores cataclysms, but the group of scientists who I mentioned, began to put together the information, they began to realize there were certain anomalies in the data, they began to realize that something horrendous had happened to the Earth much more recently than that, incredibly recently actually just 12,800 years ago at the beginning of an episode the geologists call the younger dryas, now geologists have been aware that the Earth plunged into a very radical climate shift at that time 12,800 years ago and they've been aware that there were extinctions which were associated with this time period but they never put it all together, they thought the extinctions might have been the result of human activity, hunters for example hunting down the great herds of mammoths in North America, and they didn't realize that there might have been another cause for this and that's what the new science has gradually revealed that the Earth was hit 12,800 years ago and it was hit by at least eight large fragments of a giant comet and those fragments included fragments that were a mile in diameter.