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brown dwarf

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
brown dwarf
n.
A celestial body with insufficient mass to sustain the nuclear fusion that produces radiant energy in normal stars, believed to have formed with enough mass to start nuclear fusion in its core, but without enough for the fusion to become self-sustaining.

brown dwarf
n
(Astronomy) a type of celestial body midway in mass between a large planet and a small star

brown dwarf
A celestial body with insufficient mass to sustain the nuclear fusion that produces radiant energy in normal stars. It is believed that a brown dwarf is formed with enough mass to start nuclear fusion in its core, but without enough for the fusion to become self-sustaining. Theory suggests that a body with about one percent of the mass of the Sunor ten times the mass of Jupitercan generate this initial fusion, but that it needs at least eight percent of the Sun's mass to sustain the fusion. After the fusion ends, the dwarf still glows for a period from radiating heat, with a surface temperature of about 2,500°K (4,532°F) or less. See Note at dwarf star.


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? Mentioned in ? References in periodicals archive
 
Although the minimum mass of a brown dwarf remains controversial, some researchers peg it at 13 Jupiter masses.
Scattered among the galaxy are brown dwarf stars, capable of producing energy to heat colonizing stations and power starships.
There will still be some brown dwarfs around - lukewarm objects that were too small to become stars.
 
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