It is believed that the
moon formed after something huge crashed into the Earth. If this type
of event were to happen again, with a large object crashing into the
Earth, our planet might be distorted into a more elliptical shape
rather than a round sphere. It could potentially spin so rapidly at
that point that a day might only be a few hours long! However, this
would be the least of our concerns, because if an object large enough
to influence the Earth's spin crashed into the surface, we'd all be
wiped out anyway!
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