I know I already made two posts today, but as soon as I saw this, I had to make a post for it ASAP. So, this is the Elenin Comet which will cross Earth's orbit this year on september. This comet is a small ball of ice and dust particles, about one hundred billionth the mass of our moon. There are many theories that this comet will fulfil the 2012 prophecy and many other conspiracy theories. There is even a whole site dedicated to this comet here.