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A rebuttal in Astronomy & Geophysics countered that Loeb et al. had ignored that the amount of iridium deposited around the globe, 2.0 × 10 8 –2.8 × 10 8 kg (4.4 × 10 8 –6.2 × 10 8 lb), was too large for a comet of the size implied by the crater, and that they had overestimated likely comet impact rates.
The book chronicles the evolution of dinosaurs, their rise as the dominant clade, and ends with an account of their extinction from the Chicxulub asteroid. It also includes a discussion of the evolution of feathered dinosaurs and birds' descent from dinosaurs, and an epilogue of sorts discussing the post-dinosaur emergence of mammals.
James Duncan Lawrence (() October 22, 1918 – () March 19, 1994), best known as Jim Lawrence, was an American author best known for authoring most of the Tom Swift Jr. series of books (under the pseudonym Victor Appleton II) and the "Friday Foster" comic strip.
The study confirmed previous findings that identified the asteroid as a carbonaceous-type, or C-type, asteroid, but refuted a 2021 hypothesis that the dinosaur killer was likely a comet.
While the dinosaurs met their end around 66 million years ago in a catastrophic way, their extinction may have been crucial to the development of the human race.
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James Robert Smith (born June 28, 1957) is an American author. His first novel , The Flock ( ISBN 1-59414-377-3 ), was published August 2, 2006, by Five Star. The Flock
He won the Hugo Award for his novelette "Think Like a Dinosaur (1995) and again for his novelette 10 16 to 1 (1999). Most recently, his 2005 novella, Burn , won the 2006 Nebula Award . Other stories have won the Asimov's Reader Poll and the SF Chronicle Award.