Raup David M Books
Books di Raup David M
The Nemesis Affair
Raup David M.
edizioni W W Norton & Co Inc collana W W Norton & Co Inc (Paperback) , 1999
Nemesis is the name given by scientists to a (theoretical) small companion star to our sun. Every 26 million years, Nemesis's orbit brings it close enough to the sun to bombard our solar system with billions of comets. While most of the comets will float harmlessly beyond the outer planets, some passing through the...
Extinction
Raup David M.
Gould Stephen Jay (INT)
edizioni W W Norton & Co Inc collana W W Norton & Co Inc (Paperback) , 1992
In the geological record, there are five major mass extinctions-the "Big Five." The most famous happened at the end of the Cretaceous Period, when the dinosaurs and two-thirds of all marine animal species were wiped out, opening the door for the age of mammals and the rise of Homo Sapiens. Using this example as a springboard,...