This Nearby Brown Dwarf May Have Auroras--And a Moon, Too
Glowing methane on a brown dwarf dozens of light-years from Earth may signal the presence of a large lunar companion
![This Nearby Brown Dwarf May Have Auroras--And a Moon, Too](https://static.scientificamerican.com/sciam/cache/file/B6901EF3-7FF5-424A-838C2A801A526C11_source.png?#)
Glowing methane on a brown dwarf dozens of light-years from Earth may signal the presence of a large lunar companion
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