How much would a Death Star really cost?

To the disappointment of thousands who signed the petition, the Obama administration recently informed us that it has, and will have, no plans to build a Star-Wars-style death star. Now, there may indeed be good reasons to forgo this addition to the nation's defense, but the first one listed — that it would cost 850… » 1/28/13 8:11am 1/28/13 8:11am