NASA answered a series of questions concerning the end of the world in Dec 21st, 2012
(Q): Are there any threats to the Earth in 2012? Many Internet websites say the world will end in December 2012.
A:The world will not end in 2012. Our planet has been getting along just fine for more than 4 billion years, and credible scientists worldwide know of no threat associated with 2012.
The story started with claims that Nibiru, a supposed planet discovered by the Sumerians, is headed toward Earth. This catastrophe was initially predicted for May 2003, but when nothing happened the doomsday date was moved forward to December 2012 and linked to the end of one of the cycles in the ancient Mayan calendar at the winter solstice in 2012 — hence the predicted doomsday date of December 21, 2012.
(Q) Could planets align in a way that impacts Earth?
A: 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. One major alignment occurred in 1962, for example, and two others happened during 1982 and 2000. Each December the Earth and sun align with the approximate center of the Milky Way Galaxy but that is an annual event of no consequence.
(Q): What is the polar shift theory? Is it true that the Earth’s crust does a 180-degree rotation around the core in a matter of days if not hours?
A: A reversal in the rotation of Earth is impossible. There are slow movements of the continents (for example Antarctica was near the equator hundreds of millions of years ago), but that is irrelevant to claims of reversal of the rotational poles. However, many of the disaster websites pull a bait-and-switch to fool people. They claim a relationship between the rotation and the magnetic polarity of Earth, which does change irregularly, with a magnetic reversal taking place every 400,000 years on average. As far as we know, such a magnetic reversal doesn’t cause any harm to life on Earth. Scientists believe a magnetic reversal is very unlikely to happen in the next few millennia.
Another school of thought had this to say
December 21, 2012 may or may not be doomsday but apparently at least 25 million people think that there won’t be a Christmas this year because of the Mayan apocalypse.
That’s a pretty scary statistic considering that a good percentage of these people are probably hoarding guns and other weapons to protect themselves from the impending doom. Will these people go crazy on December 20, ahead of the supposed end date?
Apparently, that thought is worrisome to NASA and the US government. A senior NASA scientist went on Current TV in yet another effort to quell the rising panic about the approaching doomsday date.
So, the world ending or not ,lets just wait for that faithful day 21st December, 2012