Time travel is the idea of going back in time to the past or forward to the future. Time travel can not be done, so far as we know now.
Movies and television shows
Much later, the American movie "Back to the Future" tells a fictional story about a professor who builds a machine that can take people into the future or back in the past. The popular British TV program Doctor Who is about an alien who has adventures by time traveling.
Images for kids
Transversal time dilation
Time travel Facts for Kids. Kiddle Encyclopedia.