A User's Guide to Time Travel
When Carl Sagan was writing his 1985 novel Contact, he asked Caltech physicist Kip Thorne how to abbreviate the lengthy flight time required for a trip to a distant star. Thorne suggested a wormhole, a shortcut through space-time that almost certainly exists as a consequence of Einsteinian principles, although one has yet to be detected. A few years later, Thorne suggested that a wormhole's entrances could be positioned in space and time as desired.
Unlike some other time machines, this Thorne-inspired design allows round trips. However, it can't take you back to a time before the machine was built.
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