How true is it that there will be a meteorite that will hit us by 2012?

No one can know when the world will end. Only God knows. In the book of Revelation, God reveals to us what the end time will be like, but not exactly when they will occur. People have been asking the same question for a couple thousand years. People can guess when it might happen, but it will only ever be a guess. All we can do is be watchful and be ready for when Christ returns.