History Channel
Season. 5 Episode. 4
http://www.history.com/shows/the-universe
http://en.wikipedia.org/wiki/The_Universe_%28TV_series%29
EXCERPTS:
TIME TRAVEL
"Time always go one way Forward.
Physicists call this Arrow of Time.
Cream mixes in the coffee,
it doesn't un-mix,
that's the arrow of time"
"All things in universe move
from ORDERLY STATES to
DISORDERLY STATS."
SPACETIME
"This means that whenever space warped,
so is time."
GRAND FATHER PARADOX.
"Physicists have come up with
at least 3 ways that nature might act
to prevent time travel paradoxes.
The first is simple: Nature prevents paradoxes
by making time travel into the past impossible.
In other words, it can't be done.
MULTIPLE UNIVERSES
You cannot change the past.
"We think that nature always somehow manages
to choose the solution that provides
self-consistency.
In other words,
You always get a solution
That does not produce a paradox."
"But we don't have to worry about about paradoxes
when we travel forward.
Taking the arrow of time into the future.
"The faster you move in space
time for you slows down
as compared to people standing still." -Einstein
Its proven by experiments.
The effect is called Time Dilation.
Russian cosmonaut,
Sergei Krikalev has logged
more than 803 days in orbit,
traveling 17,000 miles an hour,
making him the world's record holder
in time travel.
He is a 50th of a second slower
in the amount of time that has passed for him
compared to everyone else who's stayed on Earth.
To move 500 years into the future [Earth Time = 500 years]
You'd have to move at 99.99% of the speed of light for 7 years. [Space time = 7 years]
There no law of physics that says you can't go close
to the speed of light,
but your rocketship becomes hevier and heavier
as you go closer and closer to light speed.
So you require more and more fuel
to accelerate you smaller and smaller amounts,
and you need MORE THAN INFINITE AMOUNT OF ENERGY
TO ACTUALLY BREAK THE BARRIER OF LIGHT-SPEED.
Einstein's theory of relativity
says high gravity
also slows down your clock.
The Large Hadron Collider
is the largest, most complicated machine
ever created by humankind.
The Collider went operational
in Nov 2009,
And as scientists ramped up the power
the energy in its collisions
was increased almost tenfold
by March 2010,
And it will double that sometimes after
2013.
Today's theories of Space, Time, Gravity and Quantum Physics
are still incomplete.
And tools like LHC will help fill in the ever puzzling blanks.
WARP DRIVE
If we can expand at will,
we may be able to propel
a warp ship.
We make space Expand behind the ship
and make it Contract in front.
The wave of warped space
moves through the universe
FASTER THAN LIGHT,
while inside the so called warp bubble,
the ship is a passenger,
never violating Einsteins rule
against exceeding the speed of ligth.
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