By now, we've all heard the silly rumor that the world is going to end on December 21, 2012. A few different causes are "threatening" to strip us of our mortal coils: the Mayans got lazy and stopped adding days to their calendar is a popular rumor, the risk of a mysterious planet named Nibiru colliding with our own world is another.

Will this winter solstice really be our last? According to the top minds at NASA, these Earth-death rumors have about as much substance as that viral privacy hoax you've seen spreading on Facebook this week. That is to say, none at all.

"Contrary to some of the common beliefs out there, Dec. 21, 2012 won't be the end of the world as we know it, however, it will be another winter solstice," writes NASA in a Google+ post.

To dispel these end-of-the-world rumors, NASA is hosting a Google Hangout today with a cadre of top scientists in relevant fields, including astrobiology and astronomy. (Sadly, John Cusack will not be attending). Among the panelists:

David Morrison, astrobiologist from NASA's Ames Research Center

Don Yeomans, asteroid scientist from NASA's Jet Propulsion Laboratory

Mitzi Adams, solar/archaeoastronomer from NASA's Marshall Space Flight Center

Lika Guhathakurta, heliophysicist from NASA Headquarters

Paul Hertz, astrophysicist from NASA Headquarters

Andrew Fraknoi, science educator from Foothill College in Los Altos Hills, Calif.

The NASA brain trust is gathering online at 2 p.m. ET on Wednesday afternoon. Got a question for them? Ask via the Hangout, Twitter with the hashtag #askNASA or on the Google+ and Facebook threads NASA will have open for the event.

For more on NASA's debunking of the world-ending myths, check out NASA.gov/2012. The Hangout can be accessed on Google+.

Image courtesy of iStockphoto, sdecoret