The least massive brown dwarf known is OTS 44. It is only 15 times the mass of Jupiter. The least massive star is a red dwarf called Wolf 424B, which is in the constellation Virgo. Its co-ordinates...
Your brain -------->everything else that exists------------> my wang
least - electronmost - the top quark
Of the protons, electrons, and neutrons, the neutrons are most massive and the electrons are least massive.
Photons are considered elementary particles without rest mass. photons have NO MASS