Jisho

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たいようけいがいえいせい 太陽系外衛星
Noun
1. exomoon; extrasolar moonAstronomy, Rare term
Wikipedia definition
2. Extrasolar moonAn extrasolar moon, or exomoon, is a natural satellite that orbits an extrasolar planet or other extrasolar body. Although no extrasolar moons have yet been observed, it can be inferred from the empirical study of natural satellites in the Solar System that they are likely to be common elements of planetary systems. The majority of detected exoplanets are gas giants and in our Solar System, the gas giants have numerous and large collections of natural satellites.
Read “Extrasolar moon” on English Wikipedia
Read “太陽系外衛星” on Japanese Wikipedia
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