Yes I'm now officially hunting for brown dwarfs. They are hard to find but damn massive. Essentially they are objects that did not have enough mass to start fusion (some controversy about this so won't go into details). But they are illusive and not many have been found. They are interesting cause they can tell us interesting things about the formation of the rather large planets and nicely fit in the mass function between stars and planets. There are two types L and T. Anyway enough of this for a bit more info see [here].
Oh there is a good diagram (well I though it was! :-P) on [here].
I'm sure over the coming months I will rant on more and more about this, especially if I find one!! :-)
