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TL;DR: About 2150 light-years Here's the gist of my answer, for simplicity: The largest nebulae are HII regions, clouds of gas ionized by young hot stars forming inside them. We can calculate th...
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System
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2020-06-01T14:13:56Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/124355 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/