Brown-dwarf meaning

A celestial body that is more massive than a gas giant planet but has insufficient mass to sustain the hydrogen fusion reactions that produce radiant energy in normal stars.
noun
0
0
A celestial object consisting of a body of gas that gives off a small amount of radiation but lacks sufficient mass to initiate the nuclear fusion that characterizes true stars.
noun
0
0
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 Sun—or ten times the mass of Jupiter—can 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.
0
0
(astronomy) A starlike object that contracts to about the volume of the planet Jupiter after its formation phase; its mass may range from several times that of Jupiter, such that it fuses deuterium, up to just below the threshold of sustained hydrogen fusion.
noun
0
0
Advertisement