This question already has an answer here:
On an Earth-like planet, can I have a natural satellite in a stable orbit so low that it shares an atmosphere with the planet?
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marked as duplicate by Mołot, Draco18s, rek, kingledion, Mark Jan 18 '18 at 22:43
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4$\begingroup$ Unfortunately the moon wouldn't even be able to get that close to a planet in the first place, on account of the Roche Limit. Basically, large satellites get torn apart by gravitational forces if they orbit too close. $\endgroup$ – MozerShmozer Jan 18 '18 at 20:36
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$\begingroup$ Similar questions was already asked and answered on astronomy stack. $\endgroup$ – Mołot Jan 18 '18 at 20:46
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$\begingroup$ I haven't read the linked questions in full, but I want to point out that this question may not be a duplicate as it A) Doesn't specify a planet type. B) Asks "how close?" as well as "can it be this close?" But I'd have to check the others to be sure. $\endgroup$ – Era Jan 18 '18 at 21:54
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$\begingroup$ The size of the satellites is indeed largely irrelevant. They should be visible from the ground, though. $\endgroup$ – Crissov Jan 18 '18 at 21:59
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$\begingroup$ @Era The question within the body does not ask about general proximity, it asks if the two bodies could share the atmosphere. That question has been answered in two ways. $\endgroup$ – rek Jan 18 '18 at 22:52
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No, if it shares an atmosphere with the planet then air friction will quickly cause its orbit to decay and it will crash into the planet. That’s why satellite orbits decay.
answered Jan 18 '18 at 20:14
