How do the minds behind Battlestar Galactica, Prometheus, X-Men: First Class, and Torchwood go about juggling science fact and science fiction, to tell a believable story? Bad Astronomy's Phil Plait hosted a panel at San Diego Comic-Con yesterday to discuss this issue, along with the making and breaking canon in…

Last night was the debut of io9 pal Phil "bad astronomer" Plait's new Discovery show, Bad Universe. It was an explodey investigation of what would happen if Earth were hit with an asteroid, and how we could prevent it.