Sixty Six million years ago a 14 kilometer long, Mount Everest sized asteroid blasted a hole in the ground, the Chicxulub Impact, releasing the equivalent of 100 million megatons of TNT creating a 20-mile deep, 110-mile hole and sterilizing the remaining 170 million square miles of the ancient continent of Pangaea, killing virtually every species on Earth and, oddly, paving the way for the emergence of the human species.
"There's no real way to internalize that number," says Jay Melosh, University Distinguished Professor at Purdue. "It's certainly enough to lift a mountain back into space at escape velocity."
"It would have felt like the ground beneath your feet had become a ship in the middle of the ocean," says earth and space science professor Mark Richards at the University of Washington. "Then rocks would have bombarded you from a boiling sky that was beginning to take on a hazy glow. Massive wildfires would have sprouted up as the ground burst into flames. It would have seemed like the end of the world."
The asteroid itself was so large that, even at the moment of impact, the top of it might have still towered more than a mile above the cruising altitude of a 747, writes author Peter Brannen in
Ends of the World. "In its nearly instantaneous descent, it compressed the air below it so violently that it briefly became several times hotter than the surface of the sun."
"The pressure of the atmosphere in front of the asteroid started excavating the crater before it even got there," geophysicist Mario Rebolledo at the Centro de Investigación Científica de Yucatán, told Brannen. "Then, when the meteorite touched ground zero, it was totally intact. It was so massive that the atmosphere didn't even make a scratch on it."
In the Yucatán, Rebolledo continues, "it would have been a pleasant day one second and the world was already over by the next. As the asteroid collided with the earth, in the sky above it where there should have been air, the rock had punched a hole of outer space vacuum in the atmosphere. As the heavens rushed in to close this hole, enormous volumes of earth were expelled into orbit and beyond—all within a second or two of impact."