Question: If one moves at the speed of light ( Einstein) said time slows down drastically, therefore how reliable is astronomers measurement of celestial bodies distance

If one moves at the speed of light ( Einstein) said time slows down drastically, therefore how reliable is astronomers measurement of celestial bodies distance away from earth accurate.

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If one moves at the speed of light ( Einstein) said time slows down drastically, therefore how reliable is astronomers measurement of celestial bodies distance away from earth accurate.

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