Relativity
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- Santa at Nearly the Speed of Light
- An estimate of the speed and distances covered by Santa Claus on Christmas night. The physics is unassailable. The article is hosted on the Fermi National Accelerator Laboratory website.
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- Special Relativity
- Download Christoph Schiller's 1612 page walk through the whole of physics, from classical mechanics to relativity, electrodynamics, thermodynamics, quantum theory, nuclear physics and unification. chapter 2 explains special relativity. [PDF]
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- Understanding Special Relativity
- Brief explanation of special relativity, using no more than high-school level mathematics; includes an account of the twin paradox, some remarks on faster-than-light travel, and some material on relativistic mechanics. By Rafi Moor.
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- Uniform Acceleration
- This paper analyzes several simple uniform acceleration problems, including the paradox of John Bell. [PDF]
- 68
- Wikipedia: Introduction to Special Relativity
- Encyclopedia article giving a brief outline of the basic concepts of special relativity (including simple formulas).
- 70
- Chronos Shrugged: The World of Time Travel
- A brief tour of the world of time travel - from the myths and psychology to the science (including relativity). Also includes a bibliography and links.
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- Everything You Always Wanted to Know About Time Travel
- A collection of brief articles by the renowned non-fiction author John Gribbin. Includes "How to build a time machine", articles about wormholes and time travel, and a discourse on the question whether the laws of physics forbid travel into the past.
- 72
- NOVA Online: Time Travel
- Companion site to the NOVA program "Time Travel" (1999); includes a description of the connection with Einstein's theories of relativity, an interview with Carl Sagan, a teacher's guide, and a transcript of the show.
- 73
- Space-Time Physics and the Future of Time Travel
- Elementary exposition of Euclidean geometry, Newton vs. Einstein, and the possibility to travel into the future, and see into the past, in relativity. By Alex MacLellan.
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- Taking the Cosmic Shortcut
- Article on the site of the Australian Broadcasting Corporation about the physics of time travel, from special relativity and time travel into the future to general relativity, Ron Mallet's time machine, and wormholes. By Elizabeth Warnes.
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- The Relativistic Asynchronous Machine
- Design of a hypothetic machine for travel into the future by Tilmann Schneider.
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- Time Loops
- An interview on Edge with the author and physicist Paul Davies about time travel and the ensuing paradoxes, physical time-travel scenarios from Gödel's universe to wormholes, and the interplay between physics and science-fiction. Includes both a transcript and a video version.
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- Time Travel - Fact or Fiction?
- Brief overview of physics issues related to time travel, including the question of conversation laws, general relativity, possible paradoxes, and the notion of tachyons. From the Physics FAQ; original by Jon J. Thaler.
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- Time Travel and Modern Physics
- Article from the Stanford Encyclopedia of Philosophy about the basis of time travel scenarios in modern physics, including a discussion of mechanisms such as wormholes, and the question of paradoxes.
- 79
- Getting in a Twist over Time
- Article on Space Daily about Ron Mallet's attempts to design a time machine using a loop of laser light. By Michael Brooks; also includes a brief history of time travel in relativity, including remarks on wormholes and the chronology protection conjecture. (May 19, 2001)