Hal Finney wrote:
Independently, puzzling experimental results were obtained which also
pointed to the speed of light being the same for all moving frames of
reference. This was the Michelson-Morley experiment which measured
the speed of light relative to the earth's motion around the sun.
No difference was found in the speed regardless of which direction the
earth is moving.
Unfortunately I have lost the reference, but I read that the
Michelson-Morley experiments were repeated about 20 years later using more
sensitve equipment and they found that there was a difference.
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