Time Warp.

If time warping was possible would it be possible that we would have already known?

it is. Just a step to the left and a jump to the right.

LOL. Time is possible to manipulate but it would require massive amount of energy. More there is on all of the 8 planets combined. then you would only be able to travel froward in time. Backwards time travel would take even more energy.

they have done it already it was the discovery channel a few days ago gravity does it all for you.

not really. for human travel is what i refer to.