Brown dwarf

The smaller object is Gliese 229B, about 20 to 50 times the mass of Jupiter, orbiting the star Gliese 229. It is in the constellation Lepus, about 19 light years from Earth.

Brown dwarfs are substellar objects not massive enough to sustain hydrogen-1 fusion reactions in their cores, unlike main-sequence stars. Brown dwarfs occupy the mass range between the heaviest gas giants and the lightest stars, with an upper limit around 75 to 80 Jupiter masses (M_J). Brown dwarfs heavier than about 13 M_J are thought to fuse deuterium and those above ~65 M_J, fuse lithium as well. Brown dwarfs may be fully convective, with no layers or chemical differentiation by depth.

单词	Brown Star
释义	Brown Star 原声例句 TED演讲（视频版） 2018年3月合集 I transformed into a little brown rock star. 我变成了一个棕色的小摇滚明星。英语百科 Brown dwarf Brown dwarfs are substellar objects not massive enough to sustain hydrogen-1 fusion reactions in their cores, unlike main-sequence stars. Brown dwarfs occupy the mass range between the heaviest gas giants and the lightest stars, with an upper limit around 75 to 80 Jupiter masses (M_J). Brown dwarfs heavier than about 13 M_J are thought to fuse deuterium and those above ~65 M_J, fuse lithium as well. Brown dwarfs may be fully convective, with no layers or chemical differentiation by depth.
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Brown Star

Brown dwarf