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256 pages, ebook
First published June 13, 2017
(Yet, to quote a famous fictional mathematician, life finds a way. Which may or may not be much of a consolation to us as future cockroach paleontologists shift through the remains of the Holocene wondering what the hell happened to these weird bipedal vertebrates.)
“Animal life has been all but destroyed in sudden, planetwide exterminations five times in Earth’s history. These are the so-called Big Five mass extinctions, commonly defined as any event in which more than half of the earth’s species go extinct in fewer than a million years or so. We now know that many of these mass extinctions seem to have happened much more quickly. Thanks to fine-scale geochronology, we know that some of the most extreme die-offs in earth history lasted only a few thousand years, at the very most, and may have been much quicker. A more qualitative way to describe something like this is Armageddon.”
The planet will become increasingly shrubby, barren, and brown until about 800 million years from now, when carbon dioxide will drop below 10 parts per million. When this happens, photosynthesis—and thus plant life—will become impossible. When plant life disappears, so too will the animals that depend on them for food and oxygen. The rivers on these barren continents will once more flow to the sea in wide, sloppy, braiding torrents, as they did in the eons before land plants kept them channeled and winding (and as they briefly did after calamities like the Great Dying).
Even if the life-sustaining carbon cycle wasn’t petering out, at about the same time it will be getting unbearably hot. As temperatures, even at the poles, top 40 degrees Celsius and hypercanes lash the nearly barren continents, what life remains will burrow and hibernate during the mercilessly hot, months-long Arctic and Antarctic days (to say nothing of the tropics, which will have been long ago forfeited as unspeakable hellscapes). Perhaps some of these polar animals will even grow sails on their backs to dissipate the heat, like Dimetrodon. But unlike in the aftermath of the worst mass extinctions, there will be no respite. It will keep getting relentlessly hotter as the sun grows brighter. Plants will continue to disappear, and both CO2 and oxygen will continue to bleed away. Proteins will unravel and mitochondria will break down, but the winds will grow hotter still. This is the final mass extinction on planet Earth. On some specific day, at some specific hour, the last animal ever will die.”
“The meteorite itself was so massive that it didn’t notice any atmosphere whatsoever,” said Rebolledo. “It was traveling 20 to 40 kilometers per second, 10 kilometers — probably 14 kilometers — wide, pushing the atmosphere and building such incredible pressure that the ocean in front of it just went away.”
These numbers are precise without usefully conveying the scale of the calamity. What they mean is that a rock larger than Mount Everest hit planet Earth traveling twenty times faster than a bullet. This is so fast that it would have traversed the distance from the cruising altitude of a 747 to the ground in 0.3 seconds. 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. 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,” Rebolledo said. “Them 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.”
Unlike the typical Hollywood CGI depictions of asteroid impacts, where an extraterrestrial charcoal briquette gently smolders across the sky, in the Yucatan 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.
“So there’s probably little bits of dinosaur bone up on the moon,” I asked.
“Yeah, probably.”