Speed of light not so constant after all
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Even in vacuum conditions, light can move slower than its maximum speed depending on the structure of its pulses.
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Speed of light, Definition, Equation, Constant, & Facts
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Advanced Stellar Propulsion Systems
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The Speed of Light (in a Vacuum) May Not Be Constant After All
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Base for Special Relativity theory
EBC Men's Ministry
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All Stories Science News
EBC Men's Ministry
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Michelson-Morley experiment Description, Results, & Facts
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special relativity - Why the speed of light in vacuum is same in
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Why the Speed of Light (c) Keeps Constant?
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Reader favorites of 2015
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When does light travel in a straight line?
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The Speed of Light is NOT Constant, by Fermion Physics
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Speed of light - Wikipedia