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279,000 mps This answer should make sense, shouldn't it? After all, in Part I you added velocities to get the correct answer. That doesn't work here, though. Here's a hint: A ball can travel at many different speeds. How about light? 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 |