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Originally Posted by August
I guess depending on their level of technology it might. After all there's a difference between detecting a heat source in far off space and having a clue what it means.
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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.