6
Nov
2010
Seven years ago, the moment I first calculated the odd orbit of Sedna and realized it never came anywhere close to any of the planets, it instantly became clear that we astronomers had been missing something all along. Either something large once passed through the outer parts of our solar system and is now long gone, or something large still lurks in a distant corner out there and we haven’t found it yet.
Read more • Part 2
http://www.mikebrownsplanets.com/2010/10/theres-something-out-there-part-2.html