A division of science known as cryobiology studies the effects of freezing on organisms. Some cold-blooded animals and insects partially freeze during winter only to thaw out when spring comes. Some scientists are studying how these creatures can survive freezing. If humans were to freeze, the water in our cells would turn to ice and rip the cells apart. One other way to travel into the future is called time dilation .
Time appears to slow down for objects moving near the speed of light.
Theoretically, time would get slower and slower and eventually stop for someone moving at the speed of light. That is, time to the speeder would appear normal and the rest of the world would seem to be aging really fast. The only problem is that we can't yet reach the speeds needed for the time dilation to be noticeable. Travelling into the past is impossible for us now. Though, theoretically it may be possible in this universe.