Page "Brown dwarf" Paragraph 0

Brown dwarfs are sub-stellar objects which are too low in mass to sustain hydrogen-1 fusion reactions in their cores, which is characteristic of stars on the main sequence.

Brown dwarfs have fully convective surfaces and interiors, with no chemical differentiation by depth.

They occupy the mass range between that of large gas giants and the lowest-mass stars ; this upper limit is between 75 < ref >