Astronomer Phil Plait on Mayan doomsday and Nibiru a.k.a. Planet X

Astronomer Phil Plait on Mayan doomsday and Nibiru a.k.a. Planet X

Astronomer Phil Plait on Mayan doomsday and Nibiru a.k.a. Planet X.  There was a Nibiru scare back in 2003, writes Phil Plait.