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The big problem with using radar in outer space is simply range. The received flux of a radar signal falls off as $1/r^4$ instead of the $1/r^2$dependence we're used to getting for signals emitted ...
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#1: Attribution notice removed
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System
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2020-06-01T14:14:00Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/175995 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/