# Time Machine

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Once I was watching a documentary on BBC-World and a scientist was saying that they are very near to come up with a molecular size time machine. Their research was based on Einstein's theory of relativity according to which time and space are relative concepts and that the motion must be defined in relation to point of reference.

I really wonder if time machine would be a reality in future??? Are we living in parallel worlds???

What if i goto future, say 2010, and commit some crime, then came back to from where I started, 2004. What would happen when it would be 2010??? even more interesting!!! what if i go back in history and kill myself???
One very recent theory is that there is an infinite number of parallel worlds, so according to that theory (but not others) you could do whatever you liked whenever you liked with no fear of disruption to other times.
Sounds really interesting!!!
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Yes it sure does. I wish I knew more!
Someone in my class once told me that UFO's may not really be aliens at all but time machines from our future coming back to their past to see how things were in our time. Maybe they don't interact with us in the present to avoid changing the future.

How was that for a confusing post!
interesting facts!! Traveling forward in time is easy enough. If you move close to the speed of light or sit in a strong gravitational field, you experience time more slowly than other people do--another way of saying that you travel into their future.
Traveling into the past is rather trickier. Relativity theory allows it in certain spacetime configurations: a rotating universe, a rotating cylinder and, most famously, a wormhole--a tunnel through space and time.
heres one article "Our best understanding of time comes from Einstein's theories of relativity. Prior to these theories, time was widely regarded as absolute and universal, the same for everyone no matter what their physical circumstances were. In his special theory of relativity, Einstein proposed that the measured interval between two events depends on how the observer is moving. Crucially, two observers who move differently will experience different durations between the same two events.

The effect is often described using the "twin paradox." Suppose that Sally and Sam are twins. Sally boards a rocket ship and travels at high speed to a nearby star, turns around and flies back to Earth, while Sam stays at home. For Sally the duration of the journey might be, say, one year, but when she returns and steps out of the spaceship, she finds that 10 years have elapsed on Earth. Her brother is now nine years older than she is. Sally and Sam are no longer the same age, despite the fact that they were born on the same day. This example illustrates a limited type of time travel. In effect, Sally has leaped nine years into Earth's future."
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