“No, no, no, light speed is too slow!”posted by XMLicious at 9:55 PM on January 30
“Light speed too slow?”
“Yes! We're going to have to go right to... Ludicrous Speed!”
It becomes trivial to detect at .1c. At .9c, you're dealing with a Lorentz factor of 2.294. The time on the ship's clock slows1 to the reciprocal, or .436, so for every 1000 seconds here, only 436 pass on the ship.In fact, if you happen to have an atomic clock, you can detect gravitational time dilation just by flying one of them around in an airplane. Relativistic effects on satellites orbiting the earth are large enough that they need to be corrected for in order to make GPS work.
1Well, to you at home, it slows. To you on the ship, the clock runs just fine, but boy, are those clocks at home fast! This is why it is called "relativity", because everything is relative *to you*.Actually, it's a little stranger than that. To an observer at home, the clocks on the ship run slow. To an observer on a ship, the clocks at home are running ... slow! The fastest clock is always the one that you carry with you in your own rest frame; it measures your "proper time".
I suppose that would depend on the local gravity of the star system we were jumping/traveling to (if you're far enough away from your source of gravity I would think you could stop faster and with less risk of injury than if you came to a complete stop at the same rate when you were a few factors closer to the gravity source).
Yes, which is why it looks like the trip takes 4.44 years (to an observer who stays behind), when it takes only 1.94 years from the traveler's perspective. Right?Well, no. What I mean is, you know with the mars lander, we only found out about it's landing 14 minutes after it "actually" happened due to the time it took for the signal to propagate from mars to earth. We knew that the rover had landed but we didn't observe it until later.
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posted by zombieApoc at 8:00 PM on January 30 [2 favorites]