According to the Mayan calendar, the world is coming to an end on 21st Dec, 2012, barely a day and a half left to the D-day.
This kind of prediction is not the first one. In May 2003, Nibiru -a supposed planet discovered by the Sumerians, was said to be heading toward Earth. This catastrophe did not happen, forcing them to push forward to December 21, a day that Earth will experience winter solstice.
Why 21ST Dec?
The main reason they chose this day was that they wanted a connection or a link, something significant to the existing ancient calendar. A good point to link the end of the cycles in the ancient Mayan calendar at the winter solstice in 2012, hence the predicted doomsday!
So far, neither NASA nor any other scientific organization has predicted anything unusual occurrence that might endanger our planet. The reported ‘alignment of the universe’- that would cause a blackout- is an annual occurrence with negligible effect on Earth. Three days of total darkness is a hoax!