NewScientist The Last Word - Tag 'Speed-Of-Light' details

Tag 'Speed-Of-Light' details

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Is there anything in the Universe that can travel faster than the speed of light?
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Asked by jpcalafate
on 2011-03-09 23:21:15

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Categories: Our universe.

Tags: Speed-Of-Light.

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Given matter-energy equivalence, matter cannot travel at c, so how can energy(light) travel at c? In other words, light shouldn't travel at the speed of light.
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Asked by jiwasiw
on 2011-03-03 11:39:56

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Categories: Our universe.

Tags: cosmology, Speed-Of-Light, Universalweirdness.

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let us consider a electro magnet very very powerful and an iron piece 4 light years far. wiil not the piece attach to the maget only after eight years i.e. 4 light years for the energy to reach the iron and 4 light years to come back.
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Asked by sid910
on 2011-02-13 08:37:40

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Categories: Our universe.

Tags: Universe, Speed-Of-Light, wave-speed.

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How long would a tower, built on the far side of the moon, have to be for the far end of it to reach light speed?
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Asked by seasidesoulish
on 2010-11-23 21:01:23

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Categories: Our universe.

Tags: physics, Space, Speed-Of-Light, spacetravel, astrophysics, engineering, spacetechnology.

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If a pole rotating on an axle is long enough, what happens to the outer point when it reaches the speed of light?

If you attach a straight pole to an axle so that it revolves at a right angle to the axle (like spokes on a bicycle wheel) and spin it, the outside of the pole will move faster than the inside. The longer the pole, the faster the movement around the circumference.

If I built a pole that was long enough, it would get to a point where the end -if spun - should reach the speed of light, or even exceed the speed of light. However, I know that nothing can travel as fast as the speed of light. What would happen to the pole?

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Asked by AudioBlitz
on 2010-07-29 14:22:07

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Categories: Our universe.

Tags: relativity, Speed-Of-Light, spacetime, rotation.

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Why is it that nothing can travel faster than light?

Einstein said that the speed of light is a fundamental constant, but light can slow down when it goes through a medium, and John Webb has shown that 12 billion years ago the constant 'alpha' was smaller by just a millionth of it's present value, so, if the constant determining the speed of light is, in fact, variable, can the speed of light be variable too? and therefore does the absolute speed anything can travel change over time?