What If the Largest Asteroid Hit Earth?

Some seriously large asteroids have threatened Earth before. Some of these asteroids have little chance of hitting us but there are a few with very real chances of making contact. What happens if a large asteroid or comet hits Earth? And what are the chances something like Oumuamua or Bennu could actually hit our planet?

00:00 Asteroids
1:37 Chelyabinsk
02:31 Chicxulub
03:46 Oumuamua
04:54 Bennu
05:30 Shoemaker-Levy 9
06:29 Ceres

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