From the Mayan calendar and a runaway planet called "Nibiru," from killer asteroids and theories about galactic alignments: The internet is full of talk about the world ending on December 21.
NASA scientists recently addressed some of the most pervasive of these rumors around the dubious date. Take a look:
The Mayan calendar began somewhere around 3,114 years before the current era, and is set to end on December 21 or 23 (depending on the translation). NASA scientist Mitzi Adams describes what the Mayans would have done had their civilization lasted and why there is no cause for alarm.