![]() ![]() However, they are able to fuse deuterium ( 2H), and the most massive ones (> 65 M J) are able to fuse lithium ( 7Li). They have a mass between the most massive gas giant planets and the least massive stars, approximately 13 to 80 times that of Jupiter ( M J). Image is not to scale Jupiter's radius is 10 times that of Earth, and the Sun's radius is 10 times that of Jupiter.īrown dwarfs are substellar objects that are not massive enough to sustain nuclear fusion of ordinary hydrogen ( 1H) into helium in their cores, unlike a main-sequence star. Comparison: most brown dwarfs are slightly smaller than Jupiter (15–20%), but are still up to 80 times more massive due to greater density. ![]()
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