What is the lowest mass a star can have on the main sequence and why can鈥檛 objects with lower masses be true stars? What is a brown dwarf?|||About 75-80 Jupiter masses, this is what is known as a Brown Dwarf star, objects with masses like this are not on the main sequence, and are considered "failed stars" because they cannot reach the internal core temperature needed to begin hydrogen fusion.|||0.08 solar masses.
Anything below this is not massive enough to start nuclear fusion. Temperatures will not reach the minimum limit of 10 million K (18 million掳F)
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