Back to the Future, Doctor Who, Star Gate, Bill and Ted's Excellent Adventure, Terminator, The Time Machine, etc. These movies and TV shows have one thing and one witch in common, as you might guess, and that is time travel. But if you look at each separately, no time travel is the same as the other. Before we begin, let's learn what time travel is. Time travel occurs when a person, material, or object moves in a three-dimensional direction in time. The three dimensions are length, width, and height, but for this explanation we can also express them forward and backward, left and right, and up and down. If we add to these three dimensions the fourth dimension that Albert Einstein's theory of relativity (Guidry) showed is time, we get time travel. Now that we know what time travel is, I can now tell you about the different types of time travel and whether each of these types will work. These types of time travel are light speed, wormhole, black hole, time machine, cryogenics and my own theory of fast travel. To travel at the speed of light, you will need to travel at the speed of 186,000 miles per hour or also called the maximum speed limit in space in which "light always travels at the speed limit through empty space." (Space) “It would take six years at full power just to reach those speeds. » (Hawkins) “Once spaceships approached the speed of light, their crews began to travel through Earth years daily. » (Writers) But as Dr. Space says, we don't need to travel at the speed of light to travel through time since he uses "99.5% of the speed of light" for his explanation . And we don't need to travel at the speed of light to move forward in time. We can be like cosmonaut Sergei Krikalev who was in space orbiting the ...... middle of paper ...... Paradoxes and possibilities. " Space.com. Np, June 21, 2013. Web. March 2, 2014. Smith, Heather R.. "What is a black hole?" NASA Education, September 30, 2008. Web February 23, 2014. .Space , Marc. .Np, nd Web. March 2, 2014. .Wheeler, John. “The Science of Time Travel, nd Web. . "NewsComAu. Np, May 3, 2010. Web. March 3. 2014. .