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Message: <blockquote data-quote="Nyeshet" data-source="post: 5359754" data-attributes="member: 18363">You have good eyes, then. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile    :)"  data-smilie="1"data-shortname=":)" /> I can (barely) read by full moon light if I've been well away from bright artificial lights long enough for my eyes to fully adjust to the lunar level of light. Granted, I also need to wear glasses, so I expect my eyes are less adept than might be typical. Anyway, I just finished a bit more research. Photosynthesis ceases around -20.5 luminosity (500-600 lux, due to no longer being able to keep up with respiration), so even a normal sun will be fine at Jupiter distance. In fact, at 5 AU, you can get down to lower mass K stars before the luminosity is too low to allow for photosynthesis. So you could have a binary composed of a red dwarf and an orange star and it would work (albeit being as dark as a *very* overcast day [~ -21] and having incredibly slow / weak plant growth).Well, that's enough science from me today. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile    :)"  data-smilie="1"data-shortname=":)" /> Sorry if I bored you, but I myself became curious as to the answer as I read the posts and researched possible answers.</blockquote>

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