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Is it physically possible for a moon (not ours) to orbit a double-planet system?
Robert Walker
, Interested in the Moon. Especially interesting now with prob. ice at poles, possibly city sized lave tubes ...
Answered May 12, 2015
Yes no problem, so long as the moon orbits a fair way beyond the double planet. Just has circular orbits around its c of g.
Pluto is like this essentially. Pluto and Charon are a double moon, and the distant satellites orbit them both.
Also many binary stars have planets around them.
BTW if the two are tidally locked, no tidal effects. Just permanently distorted land and ocean.
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About the Author
Robert Walker
Writer of articles on Mars and Space issues - Software Developer of Tune Smithy, Bounce Metronome etc.
Studied at Wolfson College, Oxford
Lives in Isle of Mull
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