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Whoa, are you reading the same law book I've been reading? The laws of science certainly do say time travel into the past is impossible. And that same set of laws also says time travel into the future is not only possible, but it's done daily. You may believe anything you want... pigs that fly, unstoppable objects meeting immovable ones, etc. but please don't cite the physics laws when you make those assertions.

A relativity effect called time dilation shows that objects, animate and inanimate, can travel into their future. In fact, this has been demonstrated over and over again in labs, satellites, and even aircraft. For example, if a spaceship were to travel one year at 1/4 light speed and return to Earth, it would land 11 days into its future. That results because at 1/4 light speed time on Earth passes about 3% faster than on the ship during its travels. [See source.]

As to traveling into the past, that can only happen in science fiction. Worm holes, time warps, tachyons, and all that stuff have no basis in scientific fact. Although the exact nature of time is not yet well defined, we do know it is related to the second law of thermodynamics. This law says our universe has net positive entropy, which is a fancy way of saying it is running down. It is, if you will, becoming more and more broken.

And that's the crux of why time travel into the past is impossible. We can't put the universe back together again so it would be like back when... to when we would go if we could go into the past. In a simply illustrative sentence, we can't put Humpty Dumpty back together again.

And that's the little item of science the fiction writers blithely overlook in their stories. A time traveler going into the past would have to reconstruct the universe, the whole universe, as it was back then in the past. The whole universe is on the same time line and that time line marches forward only. One reason we can go into the future is because we are going forward and do not need to reconstruct a state of the universe that has not yet happened.

Sorry, while time travel into the past makes for good scifi, it is fiction only.

There are two directions of interest for time travel - forward and backward. The theory of special relativity is scientifically proven and supports forward time travel. You can look up the twin paradox in any text on relativity. It says that if you have a fast spaceship and take a long trip away from here and return using speeds near the speed of light you will have aged much less than the stay-at-homes. That is to say you might age 2 years and return to a earth time 20 years in the future.

To go backward in time you would have to do the inverse of this stay still in one place while everything else made a trip at high speed and returned. It is impossible to make the whole universe do that so backward time travel is impossible.

personally I said it can't be possible because the present theory was not enough and strong, I'm not saying I'm against this project but how can we surpass the time region even with a speed of light it still cannot be done.But if we able to send a robot with camera to the past maybe we have the chance.

Technically it is possible!!!! we are traveling through time right now as we type!

however for something to go backward into time it must go faster than the speed of light.

for something to be able to go the speed of light it must be mass less....

if you can figure out how to have less than no mass then there you go...

Theoretically. ^.^