Doomsayers who believe the world will end on Dec. 21, 2012, base their prediction on the end of the 5,125-year-long cycle of the ancient Mayan calendar.
But what will the end of days look like?
There are a range of theories about how our planet will be destroyed.
Although scientists say there's nothing to worry about, we thought you should be aware of some of the ways Earth might meet its doom.
Earth will collide with a massive rogue planet.
Believers in the Nibiru Cataclysm think Earth will collide with the rogue planet Nibiru, also called Planet X.
If a planet of this size was speeding toward us, "it would be the brightest thing in the sky," NASA scientist David Morrison tells ABC News. While he's likely exaggerating, there's no way researchers would miss a planet in our solar system. I mean, heck, we can even see rogue planets 100 light years from Earth.
An "alignment of planets" will cause a total blackout.
In this apocalyptic event, the planets align in a way that creates a total blackout on Earth.
"There are no planetary alignments in the next few decades and even if these alignments were to occur, their effects on the Earth would be negligible,"writes NASA.
A massive asteroid will destroy Earth.
In this scenario an asteroid more massive than the one that wiped out the dinosaurs will smash into Earth.
Although a newly discovered 120-foot-wide asteroid that zipped between us and the moon earlier this week may have raised some hairs, astronomers are certain that no threatening space rocks will slam into us in 2012.
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