Therologists have said (I think it was Einstien mainly) that if you could reach a certain speed on the planet, meaning the speed of light... you could travel in time, no one knows where you would end up as its impossible to determine, but my thoughts would be the past as the future is unwrittern.
Time travel is possible but i doubt it will be made in our lifetime or even advance to be able to go into the future if ever technologies were to advance on that scale to be able to create a machine that would take you to a different time era.
Also, do people know when they look up into the sky at night, they are actully looking into the past?