text: jupiter...? if jupiter had more mass, would it be a brown dwarf?  if so, how much more mass would it need?  kim love to talk science, need more discusions. have a bunch of theories i don't know what to do with. indeed it would be.  an object of about 13 times the mass of jupiter would be able to sustain core deuterium fusion, and thus be candidate for a brown dwarf.  as far as actuall main sequence (hydrogen fusion) the lowest mass ones should have about 75 times the mass of jupiter (90 times the mass of jupiter is you are making them out of nothing by hydrogen and helium).