A Jupiter-mass object orbiting a brown dwarf could become the first confirmed moon beyond our Solar System. A massive object appears to be circling a brown dwarf in the CD-35 2722 system, but calling it a moon is not straightforward. If the finding is confirmed, the object could become the first moon detected beyond our Solar System. “We have a clear delineation between the planets and the Sun in the Solar System, so defining things like moons is simple. Astronomers have spent years looking for natural satellites beyond the Solar System, but none has yet been detected with confidence.