Cosmic Log - 2012 Watch: Don't fret over Planet X

Cosmic Log - 2012 Watch: Don't fret over Planet X: "There's a fresh upswing of buzz about the potential for the existence of a large planet on the edge of our solar system, more than 10,000 times farther away from the sun than our planet. Do astronomers already have the evidence for a Planet X, and does this mean all those predictions of a planetary cataclysm in 2012 could actually come true? Not really, and here's why.
First, about that buzz: Astronomers have been wondering for years whether a Planet X, or perhaps an as-yet-undetected brown dwarf, could account for what seems to be an unusual pattern in the influx of comets from the outer solar system."