Some 66 million years ago, a city-sized Asteroid set fire to the planet and began what was likely the worst day in history. Decades of research have helped illuminate the actual impact. But scientists are still figuring out what happened over the years that followed.

Based on studies of the impact site, it’s likely that sulfur vaporized from the crater would have choked our atmosphere and blocked the sun for years or decades. So Earth likely cooled into a kind of nuclear winter, with land