A Warped View of Time Travel

Science  11 Oct 1996:
Vol. 274, Issue 5285, pp. 202-203
DOI: 10.1126/science.274.5285.202


The curved space and time of Einstein's theory of general relativity permits both time travel and travel at speeds faster than that of light. In his Perspective, Parsons describes recent theoretical studies that show how, in principle, a spacecraft in a bubble of warped space-time could travel faster than light. One consequence of this result is that such a spacecraft could also travel back in time.