The sky is falling! The sky is falling! Well no, not really, but for a few days that was the concern as the world awaited the uncontrolled re-entry of China's Long March rocket. While ultimately it landed harmlessly in the Indian Ocean it didn't stop our imaginations from running wild, so we thought we'd take a look at the growing problem of space junk, the laws governing space exploration, and how the growing commercialization of space will create challenges for both.