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As far as I know, moons that orbit a gas planet from a greater distance are less likely to be tidally locked, more likely to have a retrograde rotation but tend to have unstable orbits and axial tilts. So I would like to know what life forms such a world could sustain. What kind of climate and biomes would it have in which they could evolve? I'll specify that the moon in question does have the aforementioned conditions:

  1. It's not tidally locked
  2. It has a higher axial tilt than inner, tidally locked moons have but it's unstable (changing every few million years) due to the stabilizing force (its host planet) being further away).
  3. It has a retrograde rotation.
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    $\begingroup$ Hello 1995. This is an opinion-based question. In other words, every answer has equal value, and that's off-topic according to the help center. For example, "it would be identical to Earth's ecosystem" is just as valid as "Because of escaping gas from the gas giant, which you didn't define, so I'll say it's methane, the ecosystem will favor swamps" (BTW, that's illogical logic...). Can you tell us why you're asking? What goal are you trying to achieve? Why can't you simply select a biome based on your story's needs? $\endgroup$ – JBH Apr 28 at 21:29
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Well, one has to remember that these questions have been hypothesised before:https://en.wikipedia.org/wiki/Life_on_Titan#:~:text=It%20has%20been%20speculated%20that,methane%20instead%20of%20carbon%20dioxide.

However, the chief problem is that, in the end, this is just a hypothesis. There may be proto bacteria on Titan like planets, there may not, whether it is even possible is an open question we cannot empirically prove for now.

At any rate, do not expect complex organisms. If there is any life,it will not be sapient aliens in nor out of spaceships.

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  • $\begingroup$ I didn't expect sapient life at all. In fact, it would be just an outpost for a far more developed human civilization. I merely wanted an image by which I could imagine it. $\endgroup$ – 1995inHUN Apr 28 at 22:04
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Using the search function from the top bar of this site:

https://worldbuilding.stackexchange.com/search?q=habitable+moons[1]

I found 830 questions about the habitability of moons I suggest that reading some of the questions and answers would be very useful.

You should look up some of those questions and answers, especially the ones I have answered since my answers often contain links to scientific discussons of the possiblilites of life on exomoons.

https://worldbuilding.stackexchange.com/questions/201517/is-my-moon-realistic/201576#201576[2]

https://worldbuilding.stackexchange.com/questions/199555/how-bright-is-night-on-a-moon-orbiting-a-gas-giant/199585#199585%5B1%5D[3]

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None

Such moons tend to be in the Van-Allen-Belt of their respective planet, meaning anything close enough to the surface to see light would be irradiated to death.

It is possible that the remaining warmth in the core might give rise to something that extracts building blocks for itself from rock but i would be surprised if that's more than a chemical process. I wouldn't expect to see anything that would fill the role of proteins or information storage.

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