Quote:
Originally Posted by TLAM Strike
Well if the other side has achieved the level of telescopes and spectrographs they would be able to spot a spacecraft, determine its its closing or not using its blueshift/redshift, determine if its accelerating (by increase in shift), and determine what its emitting as exhaust (by what appears in the spectrograph).
So late 1800s in equivalent technology they would have the possibility of detection and classification.
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Well technically it might be possible but it's a very big sky. What do you think are the odds of such an object being discovered in the late 1800's or even now?