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Worldbuilding

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    $\begingroup$ Hmm, I bet it would significantly decrease how much light the moon reflects, between blood being darker than regolith and the moon rapidly developing a thin atmosphere of evaporated blood. So it would make the night sky darker, but I don't know if the reflected light would be red. $\endgroup$ Commented Dec 29, 2024 at 11:25
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    $\begingroup$ Nope. The oxygen would get released in the low pressure turning the blood dark blue/purple. $\endgroup$ Commented Dec 29, 2024 at 19:40
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    $\begingroup$ @Escapeddentalpatient. deoxygenated blood is still (dark) red, it's just the skin making it look blue/purple $\endgroup$ Commented Dec 29, 2024 at 22:36
  • $\begingroup$ @JBH Thank you very much. This is definitely much clearer. Hopefully, it didn't invalidate previous answers... $\endgroup$ Commented Dec 30, 2024 at 6:32
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    $\begingroup$ "Weird and worrying questions from my inbox." You didn't by any chance calculate that the blood of 8 billion people would result in a 4km layer on the moon, and your couple on their romantic stroll are two vampires looking up to their retirement package?? $\endgroup$ Commented Jan 1 at 0:31