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I'm wondering, if it's possible for moons to have their own natural satellites, something big enough to be spherical? Stars have planets, planets have moons. Is it possible that moons have moons too?

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It is theoretically possible, but such a satellite would probably not be in a stable orbit. Such a system is not known in the Solar system and due to gravitational perturbations it would not last long.

Popular Science Astro

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  • $\begingroup$ Are there notable examples of such theoretical systems that would be stable? $\endgroup$ – user1306322 Nov 26 '13 at 13:11
  • $\begingroup$ @user1306322 Rhea's ring (see the Astronomy post linked to above by TildalWave). $\endgroup$ – called2voyage Nov 26 '13 at 14:37

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