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Relativity FAQ

- Common Relativity questions, quality answers
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What is the Bell spaceship paradox, and how is it resolved? Bell describes two spaceships that start out at rest...
Mar11-14 10:20 AM
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FAQ: How fast do changes in the gravitational field propagate? General relativity predicts that disturbances in the...
Sep10-12 10:09 AM
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Why is the speed of light the same in all frames of reference? The first thing to worry about here is that when you...
Aug4-12 07:19 PM
2 7,893
Can I send a signal faster than light by pushing a rigid rod? One common proposal for achieving faster than light...
Oct3-11 02:07 PM
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How can light have momentum if it has zero mass? The relativistic expression for the momentum of a massive particle...
Jul7-11 10:52 AM
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Why does c have a particular value, and can it change? Short answer: Because c has units, its value is what it...
Jul2-11 12:29 PM
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I've read that in relativity the concept of the rest frame of a photon doesn't make sense. Why is that? A rest...
Jan26-11 08:11 AM
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In general relativity, gravitation is a manifestation of the curvature of spacetime. The motion of all objects is...
Aug21-08 11:42 PM
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Do photons have mass? The quick answer: NO. However, this is where it gets a bit confusing for most people. This...
Mar27-07 10:14 AM
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