Welcome to the companion Web site to the NOVA program "Time Travel,"
originally broadcast on October 12, 1999. In the program, leading physicists
delve into the mystery of whether time travel is possible, and if so, how one
might go about building a time machine. Here's what you'll find online:
Sagan on Time Travel
Listen to the late astronomer and Pulitzer Prize-winning author's insightful
and delightfully droll views on everything from
wormholes ("very Alice in Wonderland") to the nature of time ("one of those
concepts that is profoundly resistant to a simple definition"). (text and
Traveling Through Time
In this excerpt from his 1998 book Time: A Traveler's Guide, Clifford
Pickover, an IBM researcher and science writer, declares that "time travel
is possible." Find out why he is so sure.
Think Like Einstein (Hot Science)
Albert Einstein showed that space is curved, time is relative, and time
travel is theoretically possible. Here, do a simple thought experiment and
learn to think like the century's greatest scientist.
What you would call a time machine physicists term a "closed timelike
curve." Steep yourself on the concepts and conjectures, the dialects and
definitions that physicists rely on when musing about the possibility of