Time Travel Is Possible But Only To The Future,

English Physicist Says
We may be able to book our ticket to the
future someday — it'll just be a one-way trip.
In a presentation at the British Science
Festival, particle physicist Brian Cox said
that time travel is possible but only in one
direction.
"The central question is, can you build a time
machine? The answer is yes, you can go into
the future," the University of Manchester
professor told the audience during his hour-
long speech on Tuesday, according to The
Telegraph. "You've got almost total freedom of
movement in the future."
Cox detailed how time travel to the future is
possible under Albert Einstein's general theory
of relativity. Traveling hundreds, or even
thousands of years into the future, could be
accomplished if someone was traveling at an
incredibly fast pace, close to the speed of
light.
Discovery News equated the theory to the so-
called "Twin Paradox:"
Imagine twins, one stays on Earth (Twin A)
while the other (Twin B) boards a spaceship
and flies off at relativistic speeds. Compared
with Twin A's timeframe, Twin B's timeframe
will slow. If time is running slower for Twin
B, then he/she will return to Earth where a
lot more time has passed and Twin A has
aged significantly more than Twin B. The
mechanism behind this is "time dilation" and
it has a stronger effect as you travel closer
and closer to the speed of light.
Coming back from the future or traveling to
another point in the past is much less likely,
according to Cox.
Relating his theory to the popular British
science fiction show "Doctor Who," Cox
explained that the time-traveling Doctor would
need to find a wormhole in order to return to
the past. The theoretical bridge, or shortcut
through space-time, proposed under
Einstein's general-relativity theory has never
been proven to exist. And, even if a wormhole
were discovered or created, there's no telling
whether humans could actually use it to travel
through time.
Cox isn't the only one to theorize that a
wormhole could allow time-travelers to travel
backward in time. Earlier this year,
astrophysicist Eric W. Davis of the EarthTech
International Institute for Advanced Studies
said that a wormhole would be the best
option for back-in-time travel. But, Davis
acknowledged, it would "take a Herculean
effort to turn a wormhole into a time
machine."