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Should’ve been Jupiter instead of the moon. Since Jupiter protects the inner solar system from most asteroids and comets.
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It’s way more complicated than that:
https://www.youtube.com/watch?v=1zu41rrc_Ng
The way the complicated orbital mechanics work, there is a “gate” which is the only place where asteroids/comets/whatever can cross Jupiter’s orbit. This doesn’t usually result in them hitting Jupiter, but it does limit their options for hitting Earth.
Been a while since I watched the video, so I don’t remember all the details, but that should be the basic gist.
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