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186,000 mps Correct! Now you get the idea. Relative to the man on the train, the light is moving ahead at 186,000 mps, just as it is for the observer outside the train. The speed of light remains constant for all observers. Is there a solution to this paradox? Next: Figure out a Solution.... Sagan on Time Travel | Traveling Through Time Timespeak | Think Like Einstein | Resources Teacher's Guide | Transcript | Site Map Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated November 2000 |