Is there Really An Asteroid or A Comet Headed Towards Earth?

Or is this just another way to make money by scaring the people? What do you think? I definately dont believe in 2012. People have been saying the world is going to end for thousands of years. Anyway back to the original question, Is there Really An Asteroid or A Comet Headed Towards Earth? This would be a great way to make money off the naiveness of people. Especially in the US.