The best options for finding life and exploration.
Souce Titan

The sun illuminates very little on Titan, in fact, if Titan could be seen it would be a light like the light that remains in the Twilight after the sun sets because it is very far away and even so it would be quite amplified by Titan's atmosphere which also does the same, but it would be a very very faint light, as NASA wrote it, they wrote it in a statement they said it was like "the light of Twilight in a dark asphalt parking lot."
Souce Titan

Titan is a laboratory, furthermore, under those hydrocarbons, under those icy layers, under all that organic material, there is a global ocean of liquid water, normal liquid water, heated by the interior of Titan, it is a huge moon, it is the second largest moon in the solar system, only behind Ganymede and its core is hot and there is water.
Souce Ganymede

Jupiter is an engine of radiation, it is tremendous, a human with his space suit evidently on the surface of Europa would survive two days at most, in a couple of days he would receive so much radiation from Jupiter that it would be fatal for him, of course this does not affect the global ocean that exists under the icy surface of the moon Europa, luckily water ice and water in general are good insulators, good shields against radiation, so if there is, there can be life forms in that surface ocean of the moon Europa but not on the surface because it is scorched by Jupiter's radiation.
Souce Callisto

Then we have the advantage of Callisto, Callisto is further away than Europa and Ganymede, so we have a huge big moon with significant gravity, which is also essential to be able to live peacefully on a “base”, because the organism is adapted to living with gravity and weightlessness suits us quite badly, it has significant gravity and has a lot of natural resources and it also has a large amount of water ice and there would not be so much of a problem with the issue of whether there is life under that ocean of the moon Callisto, because in the case of Callisto's crust is much colder than Ganymede's and Europa's, it is much thicker, it is literally frozen in time, so there would be an enormous distance between the surface and its liquid ocean that is inside and that is why Calisto is one of the long-term objectives of space agencies to be able to explore the Jupiter system.
The images without reference were created with AI
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