I hope you aren't suggesting that this is a thing that could be real. We've explored the far side of the Moon and it's just as barren as the near one. Even if you postulate that there might be some weird form of life beneath the surface, it most certainly isn't macroscopic or capable of building things. No, the Moon is a dead rock. Life requires energy gradients: the Moon long ago lost all its internal heat and collisions from asteroids and meteors are too infrequent. It also has no atmosphere and no magnetic field to shield the surface from solar radiation. Water ice exists beneath the surface, but it never melts.
If you are committed to this fictional idea, then you have to speculate on what sort of life could exist in a place where there's no liquid water and no air, the only source of energy is radiation from sunlight, and the surface is bare rock covered by loose dust. I don't have any idea, myself; there's certainly nothing in Earth's biosphere that could live there.
Edited to add: Science fiction writers gave up on Lunarians, Venusians, and Martians as viable ideas decades ago. Our current best guesses about places in the solar system that might harbor life are in oceans that lie beneath the ice crusts of large outer planets' moons, like Europa and Titan. Such life is likely to resemble the extremophiles found deep within Earth's oceans near volcanic vents, or beneath the sheets of Antarctic ice where the melting and refreezing of water provides an energy gradient.
edited 12th Jun '18 1:30:31 PM by Fighteer
"It's Occam's Shuriken! If the answer is elusive, never rule out ninjas!"Well, are these aliens indiginous to the moon or did they come from somewhere else? And what is their level of intelligence? Are they tool users?
A bunch of silicon-based animals who browse on moon dust might be viable...
"We learn from history that we do not learn from history."Free energy in the lunar environment is minimal (entropy is relatively high compared to Earth). Such creatures would likely not be able to evolve to a macroscopic (visible to the naked eye) level, and if they did, they'd be torpid, incredibly sluggish by Earth standards. You could outrun one by exhaling vigorously. Now, if they came from somewhere else and set up shop on the Moon, then anything goes.
edited 13th Jun '18 9:03:57 AM by Fighteer
"It's Occam's Shuriken! If the answer is elusive, never rule out ninjas!"I think the safest route to go is they are imported life forms artificially supported by some currently unknown means or you could take the time to describe it.
Who watches the watchmen?
I'm trying to imagine how aliens from the far side of the moon would be like?
This is mostly planning\idea bounding by now. What would go without saying is that they wouldn't need air\water\etc. the same way we do and also there's the issue of gravity. They could be always half-jumping from all I know. Maybe fur for insultation? It's wrongly assumed that side is always dark, so my initial plans of them being not unlike abyssal fish would be wrong?