Bad Universe Twitter giveaway - including an actual asteroid!

So my TV show "Phil Plait's Bad Universe" premieres on the Discovery Channel this Sunday, August 29, at 10:00 p.m (did you see the sneak peek?). And I figure, what better way to promote it than another BA giveaway contest? Yay! So I'm giving away a lot of swag related to the show, plus some other neat stuff. To wit [click the pix to embiggen]: