Brown dwarf

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Brown dwarf.gif

A brown dwarf is a "star" whose mass is too small to have nuclear fusion occur at its core (the temperature and pressure are insufficient) - a failed star. A brown dwarf is not very luminous. It is usually regarded as having a mass between 10^28 kg and 84 x 10^28 kg. It continues to cool down and contract, turning into a compact dark object that is not easily detected.

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