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To: accountclosed who wrote (7063)3/28/1999 10:55:00 PM
From: ahhaha  Respond to of 29970
 
1. Cretaceous-Tertiary boundary which marks the global event 65 million years ago that destroyed the earth's ecosystem and apparently caused the extinction of the dinosaurs.

2. SN is the astrophysicist's acronym for supernova. It is thought that a supernova occurring within 100 light years of the earth causes the Oort debris cloud orbiting the sun way beyond Pluto to shed some of its material and send it in towards the inner planets. Perhaps the asteroid belt is an accumulation of this debris which is in a harmonically stable state. However some of it surely is encouraged to come near the gravity well of the earth, and the outcome is giant meteors raining down all around making a mess of things. In particular, the dinosaurs seem to have gotten caught in the deluge. I once wrote a paper mathematically demonstrating that the asteroid belt was of Oort Cloud origin, but it was rejected because everyone knew that the collapsed planet was the "true" explanation though that theory is inconsistent with the evidence. So I got a job in Wall Street where I could cash in on the truth.