If a planet passed near the moon and caused its orbit to decay down to earth- how long could it take and how would that effect the visible phases of the moon on earth?


closed as too broad by Carl Witthoft, StephenG, James K, J. Chomel, called2voyage Sep 6 '17 at 13:39

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    $\begingroup$ The devil is in the detail. This is impossible to answer without a very detailed (numerical) set of data to start from. It might not be workable even then. $\endgroup$ – StephenG Sep 4 '17 at 15:52
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    $\begingroup$ The latter question is easy: visible phases are purely a matter of the relative angular positions of the sun, earth, and moon (leaving out eclipses), so pretty much nothing would change. $\endgroup$ – Carl Witthoft Sep 5 '17 at 12:54