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impact × 49asteroids × 20
earth × 9
the-moon × 7
comets × 7
crater × 6
solar-system × 4
jupiter × 4
planet × 3
mars × 3
meteorite × 3
near-earth-object × 3
orbital-migration × 3
impact-probability × 3
orbital-mechanics × 2
venus × 2
meteor × 2
mercury × 2
orbit × 1
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planetary-atmosphere × 1
supermassive-black-hole × 1
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