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Long-range observation in space

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Explorers are in a spacecraft located 9 AU from a planet. Is it possible to detect fairly small objects (i.e. space stations, artificial satellites, etc., both powered and unpowered) using some sort of high-tech sensors (by which I mean at most sensors like what we have now, but more advanced)? How would this be accomplished?

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This post was sourced from https://worldbuilding.stackexchange.com/q/107980. It is licensed under CC BY-SA 3.0.

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