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If a hypothetical series of debris were to collide into a planet like Earth, I'm aware that dust could very well be sent into orbit, causing global cooling.

If this were to happen, exactly how would this look? Mostly, I want to know if the atmospheric dust would be thick enough to actually blot out light from the sun. Would it just look like a giant overcast of clouds in the sky? How low could the dust exist while maintaining orbit (or at least to maintain its place in the sky, whether due to gravity, wind, collision with other dist particles, etc.)?

What it'd look like in the sky is not the only thing I'd find helpful, but it's kind of the prevalent question in my head.

Thanks in advance!

P.S., I wasn't sure if this was the best StackExchange community to post this on — sorry if it's not!

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