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Summary: Spaceplace is a website that includes a number of scenarios to demonstrate the potential for time travel. Einstein's Special Relativity is described in a understandable way as the site is basic, not only in its explanations, but also in its graphics, which may make it easier for students to understand. The site is related to or sponsored by NASA and includes a link at the bottom to show how NASA is practically applying these principles in one of their space stations. Quality: This site is a bit more basic than the others listed, which may make it easier for students to grasp the physics concepts contained within. Spaceplace might be considered a good starting place as it is more an introduction to physics and the ideas associated with time travel, time paradoxes, and relativity.

Summary: Put out by NASA's Glenn Research Center, this website discusses what we know and don't know about science as it relates to the implications of time travel. What we know at this point in time (no pun intended), is that faster than light travel is not possible. The site also mentions other theories such as wormholes and quantum paradoxes, which have not been proven yet as viable options. The site adds that time travel is considered far more impossible than light travel. Quality: Having been complied by scientists at NASA's Glenn Research Center, this website is thorough and credible in its discussion of the possibility of time travel and the applicable Rules of Special Relativity. The site also includes some graphics to aid in understanding the basics of Special Relativity and links to other NASA related topics for further study.