There are a number of senses to the meaning of this question and so there are a number of different answers. Firstly . . .
http://math.ucr.edu/home/baez/physics/Relativity/SpeedO...
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For instance, theories of the origin of the universe -- the "Big Bang"- suggest that very early in the universe's development, its edges were farther apart than light, moving at a constant speed, could possibly have travelled in that time.
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www.sciencedaily.com/releases/1999/10/991005114024.htm
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Many novel ideas are found on the Internet. One not so novel notion is that Einstein was wrong and that the "lightspeed limit" is really just some international conspiracy of conservative "establishment" scientists. Th...
http://www.vttoth.com/LIGHT/light.htm
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Speed of light - Wikipedia, the free encyclopedia
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In physics, the speed of light (usually denoted c ) is a fundamental physical constant, the speed at which light and all electromagnetic radiation travel in a perfect vacuum, which is 299,792,...
en.wikipedia.org/wiki/Speed_of_light
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Why exactly is the speed of light constant in vacuum? I know that’s what happens, but I want to know why. Relativity simply works under the assumption of light’s constant speed, but that doesn’t prove it.
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van.physics.illinois.edu/qa/listing.php?id=2605
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Does the speed of light vary? Do varying constants go beyond relativity? Is Einstein's theory of Special Relativity threatened by the hypothesis that physical constants might have changed with time? This page comes from a site explaining Galilean relativity, electromagnetism and their apparent incompatibility; ... At the time,
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www.phys.unsw.edu.au/einsteinlight/jw/module6_constant....
www.phys.unsw.edu.au/einsteinlight/jw/module6_constant.htm
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Summary: Is the velocity of light a fixed constant of nature, invariant over time? This page presents the available measurements of c and several statistical studies which suggest that c has decreased in the past 300 years. ... ON THE CONSTANCY OF THE SPEED OF LIGHT...
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www.ldolphin.org/constc.shtml
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If, indeed, the speed of light is constant,why is it usually listed for a vacuum? Asked by: Doris Thomas; Answer; In a medium other than a vacuum, light propagates by a cascade of interactions with the molecules or atoms that make up the medium.
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www.physlink.com/ae23.cfm
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My concern is about the constancy of c (the speed of light); as light goes into a denser medium than the medium it was previously travelling in, the light slows down and it bends as a cause of this. This seemed contradicting to me that the speed of light is constant and yet its speed varies in different mediums.
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curious.astro.cornell.edu/question.php?number=630
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