Brown dwarfs aren't suns, but if they were, then 75% of all suns will be brown dwarfs. Brown dwarfs aren't planets, they can fuse atoms, but they can't fuse hydrogens into heliums. they fuse hydrogens into deuteriums and then lithiums. brown dwarfs even with no sun to orbit can rain liquid iron. Even if brown dwarfs are no suns, they are still named with the tag, 01 like in P01-WB. brown dwarfs have 3 different luminocities: L, T, & Y.