Mathematically speaking, warp speed is possible, says Eric Davis, a theoretical physicist with the Institute for Advanced Studies at Austin. In theory, he says, a warp drive creates a bubble that distorts spacetime around a moving vessel. The problem, though, is the energy required to do so roughly equates to the sun's mass. Don't give up yet. Physicists brought that energy demand down from its original estimate (the mass of the galaxy) by creating a more efficiently shaped warp bubble. Finding better ways to send that bubble through space is next.