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Just a quick question regarding Neptune. Because Phobos is spiraling in towards Mars, Mars' rotation speeds up. Does the same thing happen with Neptune's rotation?

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  • $\begingroup$ I don't have enough information for an answer, but some things to keep in mind: Neptune has a lot more moons, and Neptune has differential rotation since it is a gas giant. $\endgroup$ – called2voyage Jan 3 '19 at 16:19
  • $\begingroup$ The obvious answer is "yes, because Newton." What you need to consider is the magnitude of the effect, roughly by comparing the mass ratio of Triton/Neptune as compared with Phobos/Mars , to see if it is significant. [ the calculation is left as a homework problem :-) ] $\endgroup$ – Carl Witthoft Jan 3 '19 at 16:33
  • $\begingroup$ Let's just say it you have a moon and . planet, the moon orbits retrograde. Would it happen? $\endgroup$ – StellarExile Jan 3 '19 at 20:07
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    $\begingroup$ This is an interesting question, and since Neptune is a gas giant rather than a rocky planet, there are some interesting differences. I think this question deserves a good answer that makes this difference clear. $\endgroup$ – uhoh Jan 4 '19 at 2:20

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