brown dwarf(redirected from Hyperjovian)
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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.
(Astronomy) a type of celestial body midway in mass between a large planet and a small star
a cold, dark star that is too small to initiate the nuclear reactions that generate heat and light.
A celestial body that is similar to a star but does not emit light because it does not have enough mass to ignite internal nuclear fusion. See Note at dwarf star.