Comet strike could drastically change our rotation like it did with changing the direction of rotation of Venus or flipping the axis of rotation with Uranus, though it would kill all humans not deep underground within a few hours and then starve the survivors. Actually way worse since even Chicxulub wasn't a strong enough strike to do any of that with the planetary rotation but would have vaporized San Antonio within half a second of its impact in the Yucatan.

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