When discussing December 21, there are three types of people in the world – those who believe the rumors of an apocalypse and are completely terrified, those who believe the world will end but have accepted it, and those who don’t believe in doomsday at all.

This Friday marks the end of the Mayan calendar. This is also the day that has been rumored to be the day on which the world will end as a result.

There are several theories as to what “the end” will be. Some say that Nibiru, which is allegedly a planet found by the Sumerians, will collide with Earth. Facebook posts have been saying that NASA predicted a total blackout of the world. A giant tsunami, volcanic eruptions, and other natural disasters are said to be the cause.

According to an article on The Huffington Post, a man in Xinjiang, China allegedly spent his family’s savings in order to build an ark – yes, like Noah’s ark – hoping to survive what may come. On the other hand, apparently a carpenter in Chongqing, China used his life’s savings to party on his “last days on earth.”

Do these people really have anything to worry about? According to the National Aeronautics and Space Administration, the answer is no.

“Dec. 21, 2012 won’t be the end of the world as we know, however, it will be another winter solstice,” the official NASA website says.

The same Web site confirms that no, there is no planet called Nibiru heading towards Earth. If there were, it would be visible to us by now. NASA also says that the blackouts were Internet hoaxes and that they have predicted no such thing.

If you’re still having your doubts, remember all the times that the world was supposed to end – and didn’t? These hoaxes have been around for a while, and each time they have been proven wrong.