https://www.techtimes.com/articles/235027/20181011/moonception-study-shows-bigger-moons-can-have-moons-of-their-own.htm
Moonception: Study Shows Bigger Moons Can Have Moons Of Their Own
Oct 11, 2018 - The moon has the right conditions to have its own moon. According to a new study, while it has not been observed in the Solar System, moons can have their own...
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