Phil Plait is an astronomer and major sci-fi geek. He writes the Bad Astronomy Blog for Discover Magazine and is also the host of the Discovery Channel's science show "Phil Plait's Bad Universe." You can follow him on Twitter at @BadAstronomer. On September 13, 1999, a tragedy befell all mankind. An accident of unknown origin at the nuclear waste dumps on the far side of the Moon caused a massive explosion which hurled the Moon out of Earth orbit.