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186,000 mps That's right! Relative to the observer, the light is moving at 186,000 mps. Seems non-commonsensical, doesn't it? But this has proven to be true through many experiments over the years. on to part 3.... 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 |