Question: **The context:**

There is a population of people surviving on a lunar-analogue's surface, descended from the crew of a crashed spaceship. The rest of their society is not relevant to the question, but their technology includes cobbled together habitats and void suits that protect against some solar radiation but not all (an arbitrary amount that allows them to maintain a population, but not necessarily easily).

**The question:**

What skin colour would this select for? I'd initially say a pallid white given the lack of UV exposure, but I've recently stumbled upon research which suggest melanin provides at least some protection against gamma radiation: <https://www.news-medical.net/amp/news/20110824/Melanin-also-protects-from-ionizing-radiation.aspx>

The question is, what skintone would partial protection from gamma radiation on a longstanding permanent lunar culture select for?

For reference, this is for an art project where colour palette will be important, so injecting some realism into the skintone and working from there would be the way to go.

Answer: 
There would be no evolutionary pressure for a specific skin tone for living on the Moon, because -- even were we to colonize the Moon -- no one lives on the Moon like they live on the Earth.

That's because people will live **inside all the time**, getting their Vitamin D from either food or the interior lighting.

It's somewhat similar to white people living in Australia. You'd think that Europeans with darker skin would be more genetically successful, but they aren't. Why? Because clothes (and hats) shield them from the excess UV, while allowing enough to get to the exposed body parts.
As already pointed out - there would be no real external evolutionary pressure, thus sexual selection would be the way to go.

Short term:
-Just mixing up whole gene pool. (so mixed color skin, dark eyes, dark hair etc) 

Long term:
**Survival of the cutest.** (but it is based on assumption, that there would be either a lot of time or possibility to pick designer babies)

-light skin (setting all PC aside, its not a recent phenomena, but something more entrenched. According to records in East Asia lighter skin was being perceived as attractive even in times when Europeans were just considered as some distant barbarians; moreover even in Europe there were periods when lead based white makeup was top trendy)

-blue eyes, blond hair (those genes are recessive, so would not manifest easily)

-neonate features of Asian face

-tall (it's also selected in sexual selection, and in low gravity setting it would have less drawbacks)