Scientists from NASA are about to announce that they think they’ve discoverd a tenth planet in our solar system. Depends on your definition of planet, of course (since we can’t even agree about Pluto), but cool stuff anyway. The newbie is called Sedna, it’s about 3 billion km farther from the Sun than Pluto is, and it’s a small fry with a diameter of less than 2,000 km.
Everybody say, “Hi, Sedna!” 