Exomoons: On the hunt for mystery moons. The search for exoplanets, which orbit distant stars, has opened up a whole galaxy of worlds beyond our own. Over 3,700 have been discovered to date, but they may have companions. Since the first confirmed discovery of planets beyond our own Solar System over 20 years ago, we have known that our stellar neighbourhood is not unique in the Universe. Artwork by: Vadim Sadovski
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