Special Theory of Relativity Essentials

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Developed by

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Albert Einstein

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Year of publication

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1905

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Key postulate 1

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Laws of physics are the same in all inertial frames

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Key postulate 2

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Speed of light is constant in a vacuum

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Time dilation

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Time slows down at high speeds

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Length contraction

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Objects shorten in direction of motion

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Mass-energy equivalence

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E=mc²

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Inertial frame

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Non-accelerating reference frame

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Simultaneity

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Relative to observer

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Lorentz transformation

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Mathematical equations for relativity