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Message: <blockquote data-quote="Nyeshet" data-source="post: 5359669" data-attributes="member: 18363">Okay, but to be technically just one more time ... <img src="http://www.enworld.org/forum/images/smilies/nervous.png"  class="smilie" loading="lazy" alt=":heh:" title="Nervous Laugh    :heh:" data-shortname=":heh:" />All below presume a world 5 AU distant from a star of the stated solar mass.Mass. Type. Lum . . Notes2.0 . A . . -26.8 . 1.25 Ba out of 1.44 Ba lifespan, sun as seen from earth1.5 . A/F . -25.5 . 2.52 Ba out of 3.21 Ba lifespan, sun as seen from Mars (-25.6, aphelion)1.25. F5. . -25.0 . 4.51 Ba out of 5.01 Ba lifespan, sun as seen from (almost) Mars1.0 . G . . -23.45 .4.64 Ba out of 10.0 Ba lifespan, sun as seen from ~JupiterConsidering the pictures returned from Mars, it looks like you can get as much illumination as you need with just an F type type (F0 to F5), but a Sun-like star will only be enough if you think photosynthesis would work on a warmer Europa. The full moon may give just enough light for dark adjusted eyes to notice shadows, but plants don't grow much under its light (and the sun as seen from Pluto is quite a bit brighter - and just the brightest star in the night sky from Pluto's point of view).</blockquote>