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200000000000000000000000000009 or something like that. We don't know for sure when or what time the comet will hit us but I'm sure that the news would warn us.The above answer is wrong because earth will be gone in about 7.5 Billion years due to the sun becoming a red giant and engalfing it and 7.5 million years is 75000000000. Comets hitting earth is very rare and hard to tell if one has ever hit earth but one is speculated to have hit earth 12,000 years ago but they hit earth much more rarely than meteors and asteroids. Most of them are either pushed away from the earths atmosphere or burn up in it. So I suspect it probably won't happen for a very long if one indeed did hit earth only 12, 000 years ago. I don't expect another one to hit earth for at least another 300, 000 years from now.
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14y ago

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