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How Time Travel Works in Science Fiction (Infographic)

Chart of various methods of time travel.
Is time travel possible? Are the past and future set or can they be changed? Sci-fi books and films have long explored these ideas. (Image credit: by Karl Tate, Infographics Artist)

Scientists define time as one of the four dimensions of "space-time," a term used to describe the totality of the universe. 

Related: Time Travel Theories

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Karl's association with Space.com goes back to 2000, when he was hired to produce interactive Flash graphics. From 2010 to 2016, Karl worked as an infographics specialist across all editorial properties of Purch (formerly known as TechMediaNetwork).  Before joining Space.com, Karl spent 11 years at the New York headquarters of The Associated Press, creating news graphics for use around the world in newspapers and on the web.  He has a degree in graphic design from Louisiana State University and now works as a freelance graphic designer in New York City.