Moonmoon | Wikipedia audio article
Channel: wikipedia tts
Date: 18/11/2018

This is an audio version of the Wikipedia Article:
Moonmoon

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- Socrates



SUMMARY
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A subsatellite is a natural satellite (or an artificial satellite) that orbits a natural satellite, i.e. a "moon of a moon", also known as a moonmoon or submoon.It is inferred from the empirical study of natural satellites in the Solar System that subsatellites may be elements of planetary systems. In the Solar System, the giant planets have large collections of natural satellites. The majority of detected exoplanets are giant planets; at least one, Kepler-1625b, may have a very large exomoon, named Kepler-1625b I. Therefore, it is reasonable to assume that subsatellites may exist in the Solar System, and in planetary systems beyond the Solar System.
Nonetheless, no "moon of a moon" or subsatellite is known as of  2018 in the Solar System or beyond the Solar System. In most cases, the tidal effects of the planet would make such a system unstable.