mdl:
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I mean he is traveling relative to "motionless" observer (e.g. on Earth orbit).
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OK, that clears it up.
Reading more threads is a good idea, so is reading some course material. I don't think anyone knows 'why' relativistic effects happen and we're a long way from a physical model similar to sound propagation. Relativity works without needing an aetherial 'medium' for light to propagate in ( or through ).