Move over, giant meteor. Here’s what the largest comet would do to Earth
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Out there, in the farthest recesses of the Solar System, a great existential threat lies in wait: the Oort cloud. Formed at the same time as the protostar that would become our Sun and the protoplanetary disk that would give rise to the planets, asteroids, and moons, it largely consists of the remnants of that same primitive material. Whatever wasn’t either boiled off by the Sun or locked up into the planetary, lunar, asteroidal, or Kuiper belt objects we have today persisted in a series of obje
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