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en.wikipedia.org/wiki/Speed_of_light

The speed of light in vacuum, commonly denoted c, is a universal physical constant ...

www.emc2-explained.info/The-Constant-Speed-of-Light

The speed of light is certainly very impressive, but it has another quality that is even more remarkable. In free space (i.e. a vacuum) its speed is constant.

www.livescience.com/29111-speed-of-light-not-constant.html

Apr 27, 2013 ... The speed of light may not be constant, a possibility that could have broad implications for fields of cosmology and even astronomy, say ...

math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/speed_of_light.html

If the mass weren't zero, the speed of light would not be constant; but from a theoretical point of view we would then take c to be the upper limit of the speed of  ...

www.physicsoftheuniverse.com/topics_relativity_light.html

It was the young Einstein's genius to explain just WHY the speed of light is constant and does not depend on the speed of its source or its observer. In 1905  ...

www.desy.de/user/projects/Physics/Relativity/SpeedOfLight/speed_of_light.html

This defines the speed of light in vacuum to be exactly 299,792,458 m/s. This provides a very short answer to the question "Is c constant": Yes, c is constant by  ...

www.sciencenews.org/article/speed-light-not-so-constant-after-all

Nov 14, 2014 ... The speed of light in a vacuum, usually denoted c, is a fundamental constant central to much of physics, particularly Einstein's theory of relativity ...

www.theguardian.com/science/2016/nov/28/theory-challenging-einsteins-view-on-speed-of-light-could-soon-be-tested

Nov 28, 2016 ... New paper describes for first time how scientists can test controversial idea that speed of light is not a constant.

newt.phys.unsw.edu.au/einsteinlight/jw/module6_constant.htm

... of light constant? The fine structure constant α ... One could say that they determined the ratio of the speed(s) of light in the two directions. For example, the  ...