The warp drive, one of Star Trek’s hallmark inventions, could someday become science instead of science fiction. Some physicists say the faster-than-light travel technology may one day enable humans to jet between stars for weekend getaways. Clearly it won’t be an easy task. The science is complex, but not strictly impossible, according to some researchers studying how to make it happen. The trick seems to be to find some other means of propulsion besides rockets, which would never be able to accelerate a ship to velocities faster than that of light, the fundamental speed limit set by Einstein’s General Relativity.