What if a giant asteroid had not wiped out the dinosaurs?
When you purchase through links on our website , we may earn an affiliate commission . Here ’s how it works . One fatal day 66 million years ago , the dinosaurs — which had inhabited Earth for about 165 million yr — got a nasty surprise : A some 9 - nautical mile - wide ( 15 kilometers ) asteroid crashed into what is now Mexico , actuate tsunami , wildfire and acrid rain and causing vast measure of junk to block out the sun ....