The original earlier "Moonmoon" article (see copy below) has since been redirected to the "Subsatellite" article. Drbogdan (talk) 20:17, 11 October 2018 (UTC)
Nonethess, no "moons of moons" or subsatellites (natural satellites that orbit a natural satellite of a planet) are currently known as of 2024[update] in the Solar System, or beyond the Solar System. In most cases, the tidal effects of the planet would make such a system unstable.
However, calculations performed after the recent detection[12] of a possible ring system around Saturn's moon Rhea indicate that satellites orbiting Rhea could have stable orbits. Furthermore, the suspected rings are thought to be narrow,[13] a phenomenon normally associated with shepherd moons. However, targeted images taken by the Cassini spacecraft failed to detect rings around Rhea.[14]
It has also been proposed that Saturn's moon Iapetus had a satellite in the past; this is one of several hypotheses that have been put forward to account for its equatorial ridge.[15]
^Kollmeier, Juna A.; Raymond, Sean N. (8 October 2018). "Can moons have moons?". Monthly Notices of the Royal Astronomical Society: Letters. 483: L80–L84. arXiv:1810.03304v1. doi:10.1093/mnrasl/sly219.
^ abForgan, Duncan (4 October 2018). "The habitable zone for Earthlike exomoons orbiting Kepler-1625b". arXiv:1810.02712v1 [astro-ph.EP].
^G. H. Jones, E. Roussos, N. Krupp, U. Beckmann, A. J. Coates, F. Crar, I. Dandouras, V. Dikarev & M. K. Dougherty, P. Garnier, C. J. Hansen, A. R. Hendrix, G. B. Hospodarsky, R. E. Johnson, S. Kempf, K. K. Khurana, S. M. Krimigis, H. Krüger, W. S. Kurth, A. Lagg, H. J. McAndrews, D. G. Mitchell, C. Paranicas, F. Postberg, C. T. Russell, J. Saur, M. Seiß, F. Spahn, R. Srama, D. F. Strobel, R. Tokar, J.-E. Wahlund, R. J. Wilson, J. Woch, D. Young (7 March 2008). "The Dust Halo of Saturn's Largest Icy Moon, Rhea – Jones et al. 319 (5868): 1380 – Science". Science. 319 (5868): 1380–1384. Bibcode:2008Sci...319.1380J. doi:10.1126/science.1151524. PMID18323452. S2CID206509814. Retrieved 11 October 2018.((cite journal)): CS1 maint: multiple names: authors list (link)Pdf