As any
self-respecting science fiction fan knows, wormholes—theoretical shortcuts
through space and time—make for excellent time travel portals. One such movie to
transport people into the past is A Sound of Thunder,
based on the classic 1952 Ray Bradbury novella. In it, a group of hunters build
a time machine, which looks like a wormhole of sorts, to travel back to the
dinosaur era. There, things go awry when one hunter kills a butterfly, which
completely changes the course of history. The movie was widely panned by critics
and seems to have quickly slipped out of theaters. But the questions it
raises—the mystery of time and the possibilities of traveling through it—remain
among the thorniest in physics, keeping a growing number of scientists occupied.
It's not like scientists are
looking for a way to actually travel through time. But some believe that
theorizing about how it could be done—maybe by using a wormhole in space—will
help them understand and perhaps even revise the laws of physics. "Traversable
wormholes are extremely useful as gedanken experiments"—the term describes
experiments that can be reasoned theoretically but are impractical to carry
out—"to probe the limitations of general relativity," said Francisco Lobo, an
astrophysicist at the University of Lisbon in Portugal.
Quantum Leap
: Albert Einstein's relativity theory set the speed of light as the universal
speed limit and showed that distance and time are not absolute but instead are
affected by one's motion. A clock in motion will always appear to run slowly
compared with one at rest, because time is relative to the speed at which a body
is moving. That fact would, in theory, allow for time travel—at least if you
have a very fast spaceship. Consider this: If an astronaut travels into space
for six months at a substantial fraction of light speed and takes another six
months to return to Earth, he would land in the future. While a year will have
elapsed on the astronaut's clock, tens of thousands of years may have gone by on
Earth, depending on how close to light speed the astronaut traveled...
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1996-2007 National Geographic Society 
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The Montauk Project
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