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Time travel is possible through the theory of relativity, but it requires traveling through both time and space. The faster an object moves, the slower it ages compared to a stationary object. Wormholes and black holes are potential means of time travel, but building a rocket capable of withstanding the pressure and heat is necessary.
In short, building a time machine is possible, but just because building something is possible, however, doesn’t make it easy or probable. Albert Einstein’s theory of relativity states that time and space cannot be separated but depend on each other. Therefore, a time traveler must move through both time and space. For example, if a traveler went back in time six months but didn’t travel in space, he could exit the time machine into outer space, because the Earth would be on the other side of the sun. Spacetime is the entity through which a time machine must travel.
Time travel is possible. The faster an object moves, the slower it ages compared to a stationary object. If the time machine approaches the speed of light in space, it will return to Earth many years into the future.
When people look at the stars, they see into the past, because it took light years for light to reach Earth. In theory, the person in the time machine would travel through time but not age. Humanity has yet to build an engine that propels a rocket capable of carrying a human being at the speed of light, or a rocket capable of withstanding the pressure and heat that would result.
Science fiction buffs are familiar with wormholes as a means of not only traveling through time but also bridging the gaps between two distant places. In the television series Star Trek: Deep Space 9, spaceships travel through wormholes to reach the far corners of other universes. Wormholes can be understood best when visualizing a piece of paper with a hole on both ends. The distance between the holes is reduced by folding the paper and placing the holes on top of each other. The small space between the two holes is the wormhole.
Black holes in space have a greater gravitational pull. Objects in space, such as comets, asteroids, and even entire solar systems are sucked into black holes. The black hole’s gravitational pull eventually bends light and changes, slows down, the speed at which light travels. If Einstein is right that nothing can travel faster than the speed of light, then time itself has slowed down near the black hole’s mouth.
If a man piloted a rocket or spaceship near the mouth of the black hole, he would find himself in a time machine, because the time he is traveling in moves slower than time in the rest of the universe. As he drives his ship away from the black hole, time would move away from the black hole faster and, presumably, will in the future.
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