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Astronomers spot planetary-mass exomoon circling a brown dwarf

Astronomers have found what appears to be a planetary-mass exomoon circling a brown dwarf in the stellar system CD-35 2722. The brown dwarf orbits a star with about half the mass of the Sun, and the newly found moon circles the brown dwarf in turn. The candidate was detected through a repeating dip in the brown dwarf's light. If confirmed, it would be one of the clearest exomoon candidates found to date and a rare example of a moon-sized body outside our solar system. Its planetary-scale mass challenges current models of moon formation and suggests brown dwarfs can host large moons. Follow-up observations with larger telescopes are already planned.