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A cosmic void. Your best bet would be in a cosmic void. While not entirely empty - they do contain small numbers of galaxies and clouds of gas - they are substantially rarefied compared to your av...
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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/171642 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/