An interesting discussion of some recent reports:

Could There Be Massive Planets in the Far Reaches of Our Solar System?

In short,a  few as-yet-non-peer-reviewed reports suggest that there are a multitude of Earth-size and larger planets floating around *waaaay* out there, including a potential brown dwarf at an impressive distance of 20,000 AU, conveniently located almost directly on the way to Alpha Centauri.

Problem is… probably not. If the most optimistic estimates of what have been seen are true, then extrapolating the discoveries over the whole sky would seem to indicate that the solar system includes not three-ish Earth sized worlds, but hundreds of thousands of them. The total mass of all these worlds would seem likely to make a hash of the solar systems gravity field, throwing the orbits of the outer worlds into chaos.

In any event, it’s great seeing new stuff being discovered Way Out There. The future of mankind lies in the dark between the stars.