Recently many exoplanets have been found orbiting nearby stars. Assume there is a civilization with identical technology residing in a nearby (< 100 light years) solar system. Could they discover Earth or other planets orbiting the Sun?
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1$\begingroup$ Probably more suitable for Astronomy. $\endgroup$– StephenG - Help UkraineCommented May 12, 2020 at 8:21
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They probably could, but if they were identical, as they would have the understanding of gravity, doppler effect, spectrography, and it's applications to chemical analysis to spot us.
