There are lots of theories behind what will happen on December 21st 2012. We of course have ideas that the Earth will have its 25,000 year cycle of a Polar Shift causing catestrophic global weather changes, a meteor will hit the Earth causing a similar situation to what is believed to have happened to the dinosaurs, we'll all go through a new phase in our awakening as a species and reach higher levels of awareness, we have the most popular Nibiru theory of course in which either the planet/star will cause the Polar Shift or the Annunaki will return. With many theories out there its hard to decide which one is true. This is just a short video which shows what would happen if a meteor hit.