NASA announced today the discovery of a mysterious planet-like body, which has been unofficially named "Sedna."3 times farther away from Earth than Pluto, it is now the most distant known body in our solar system. Click on the artist's conception (credit: NASA/JPL-Caltech/R. Hurt) to view larger, or here(1) to read more details.
1. http://www.nasa.gov/vision/universe/solarsystem/planet_like_body.html