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. It begins when an amateur astronomer spots something in the sky that shouldn't be there. A hurried email, a chat over the 'net, and then confirmation from professional observatories—but a discovery kept secret from the public.