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1. First postulate (principle of relativity)

The laws of physics are the same in all inertial frames of reference.

2. Second postulate (invariance of c)

The speed of light in free space has the same value c in all inertial frames of reference.

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"On the Electrodynamics of Moving Bodies" by Albert Einstein, published in 1905.

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- Lorentz and Fitzgerald suggested that the motion through aether produced a deformation of the length of the body in the direction of the motion.
- Poincarè stated that aether doesn't exist and Maxwell's equations hold in every inertial frame of reference.

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3c) What is wrong? Maxwell's equations or Galilean's transformations?

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3c) What is wrong? Maxwell's equations or Galilean's transformations?

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Coherent light: a beam of electromagnetic waves that are identical (same amplitude, lambda and omega) and in phase.
Semi-silvered mirror: a mirror than is half transparent and half reflective.

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Neil deGrasse Tyson explains the Michelson-Morley experiment excerpt from UNDAUNTED

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2a) How to detect velocity of light in aether...

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2a) How to detect velocity of light in aether...

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Thinking about how Earth's relative velocity to hypothetical luminiferous ether can be used to detect ether.