Submission + - Small World Spotted Far Beyond Pluto (sciencemag.org)
sciencehabit writes: Astronomers have detected a small world more than twice as remote as Pluto, lying 12 billion kilometers, or 83 AU, from the sun. The new object is the first ever found whose orbit resembles that of Sedna, a far-off body that never gets close to Neptune's path. The new world is roughly 450 kilometers across, just one-fifth Pluto's diameter. Both Sedna and its small sidekick probably belong to the inner part of the Oort cloud, the frigid reservoir of long-period comets that can dazzle us when they dash toward the sun, and suggest that many other far-flung objects await discovery.