Actually, according to quantum mechanics, particles travel back in time all the time. Check out Schrodinger''s Kittens and the Search for Reality for more information.

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Time Traveling to the past is immpossible in my theory and I''ll show you why!

All atoms shake around. This is movement. Movement is to start from one point and go to another. This involves distances. So, because all distances are either 0 or positive, you can''t go -7 feet. And therefore, because going forward in time involves movement, any movement will force time forward. So, the only way to go backwards in time is to go a negative distance which is immpossible. Now for all those people who think that backwards time travel is possible to start flaming me.

Well, I''m unsure on whether time is a arrow or not, but here is how I would counter your argument:

Let''s say the current belief is true: that the universe is expanding (from the big bang). Therefore, it is safe to say the we are predominantly moving in one direction (the rotation of the planets, galaxy, and movement of atoms is insignificant). Threfore, distance, for us, is going in one direction. Let''s call it positive. If we could go faster than this speed of expansion in the direction opposite of expansion, we could then achieve our negative direction, threby making us go back in time.

I don''t know how much I''m stretching with this argument, but I think it''s pretty logically sound (coming off the top of my head). If you''ve ever read Stepehn Hawkings, "A Brief History Of Time", it says somewhere in there that when/if the universe were to stop expanding and start contracting, time would begin to go backwards. So, let''s see what you guys can say about that.

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I don''t think time travel is possible either way, but that has got to be the logic of a 5 year old who has only the vaguest concepts of physics.

"And therefore, because going forward in time involves movement, any movement will force time forward."

Who says movement causes any time shift? If I were to stand completely still, time would stop for me?

Problem with this, is that you can never truly stand still. You will always be slightly moving (heart beating, cells replicating, atoms vibrating). I know scientists have tried to stop an atom from moving by freezing one at absolute zero, but no success has been made. They can get close to abs zero, but no cigar. They are unsure on what will happen once it does moving, but one theory is that gravity will cause the electron to collide onto the nucleus creating an explosion. Or, it just might stop, frozen in time. Who knows?