 |
 |
 |
Speed of Light Can Vary? Nice try, but the results have been verified many times and are indeed valid. Try again. 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 |