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