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According to New Scientist (This article and its images were originally posted on New Scientist October 10, 2018 at 10:24AM.)
Stars are orbited by planets, which are orbited by moons, but what comes next? More moons, according to a new analysis.
Juna Kollmeier at Carnegie Observatories in Pasadena, California, and Sean Raymond at the University of Bordeaux, France calculated whether a moon orbiting a planet could have a moon of its own.
A moon of a moon has no formal name, perhaps because we have never spotted one, but both submoon and moonmoon have been suggested.
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