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Frequently Asked Relativity Questions

Meta Thread / Thread Starter	Last Post	Replies	Views
Speed of gravity: How fast do changes in the gravitational field propagate? C NR bcrowell	Sep10-12 10:09 AM bcrowell	0	3,006
Why is the speed of light the same in all frames of reference? C Greg Bernhardt	Aug4-12 07:19 PM bcrowell	2	5,195
Can I send a signal faster than light by pushing a rigid rod? C NR DaleSpam	Oct3-11 02:07 PM DaleSpam	0	6,619
How can light have momentum if it has zero mass? C NR bcrowell	Jul7-11 10:52 AM bcrowell	0	5,508
Why does c have a particular value, and can it change? C NR bcrowell	Jul2-11 12:29 PM bcrowell	0	3,413
Rest frame of a photon C NR D H	Jan26-11 08:11 AM D H	0	5,504
If photons don't have mass, why do their paths "bend" in a gravitational field? C NR jtbell	Aug21-08 11:42 PM jtbell	0	4,276
Do photons have mass? C NR ZapperZ	Mar27-07 10:14 AM ZapperZ	0	8,950

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