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With the naked eye, humans can see approximately 6th-magnitude objects. We can compute the apparent magnitude of a planet at a given distance, and find the distance corresponding to an apparent mag...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:57Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/134259 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/