Brown dwarf
type of substellar object larger than a gas giant
English: A brown dwarf is an object that is larger than a planet, but smaller than a star.
Gliese 229B
editGliese 229B is one of the first brown dwarfs to be discovered, and the first to be generally accepted. It is also one of the best known brown dwarfs.
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Left discovery image, right Hubble image
Brown Dwarf LP 944-2
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First flare ever seen from a brown dwarf
http://www.nasa.gov/images/content/406089main_spitzerC20091123-full.jpg archive copy at the Wayback Machine
Other
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Sun, Gliese 229A, Teide 1, Gliese 229B & Jupiter