Once upon a time... as in, about 65 million years ago, give or take... a large asteroid crashed into the Earth and wiped out the dinosaurs. Well, it's about to happen again. This time, it’s a comet, and it’s gonna wipe out a whole lot more than dinosaurs, because it’s a whole lot bigger... as in, it’s about the size of Australia. So this time, the entire human race is on the extinction list...
