00:00What did Earth actually look like 24 hours after the asteroid struck?
00:09Within hours, megatsunamis thousands of feet high battered coastlines,
00:14while debris falling back to Earth ignited global forest fires.
00:19Then came the true collapse.
00:22Billions of tons of sulfur and soot blocked sunlight,
00:26plunging the planet into years of freezing darkness.
00:30While giant dinosaurs couldn't adapt,
00:33small burrowing mammals and early birds survived the darkness underground and in deep waters.
00:41Without that single terrible day, human beings might never have evolved.
00:47Follow for more ancient history mysteries.
