Astronomers have discovered a brown dwarf only about 7.2 light years away, making it one of the Sun's closest neighbors. A brown dwarf is generally referred to as a failed star-- an object with a composition similar to a star that lacks the mass needed to ignite nuclear reactions.
The object hasn't been found before now because it's so dim in visible light. It was found by using the infrared part of the spectrum. It's also small as these things go-- only a few times more massive than Jupiter;.
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