Brown dwarf

English: A brown dwarf is an object that is larger than a planet, but smaller than a star.

Gliese 229B

Gliese 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