On the moon Europa, although it is possible that there is life in that subsurface ocean, on the surface there is no possibility of life existing. Jupiter, unfortunately, is very radioactive. In fact, humans would not last two days on the surface of the moon Europa. Even with a space suit, a manned human ship exploring the moon Europa will have to be specially shielded because of the radiation issue, which is very dangerous.
Ganymede already receives a little less radiation and the ideal place to establish a base to explore the Jupiter system would be Callisto because it is further away and there is an abundance of water and natural resources, obviously frozen water.
On Mars we cannot expect to find anything other than bacteria because they are bacteria that survive after millions of years underground, that there is an underground tunnel with water and that there would be creatures, a possibility but very remote, if on Mars what we could find They would be bacteria under the Martian soil on the moon Europa we can find anything, because the oceans of the moon Europa, we know that they have existed for billions of years, so those oceans have had billions of years of time for there to be life arose and there would be no life like on Mars It could have emerged on the surface, but it had very little time to evolve.
Water is a good shield against radiation, in fact, in some ship designs what is done is to place the water tanks on the outside of the ship so that they serve as protection for the habitable part of the ship.
Mars had the opportunity for life to emerge at least at the bacterial level, just like here on Earth, if we come to the conclusion that Mars had the same elements of water, substances, all the elements that the Earth had at the time to form life, Although it did not have that much time to evolve, keep in mind that complex life, animals, all insects, plants, etc., complex life emerged relatively recently 650 to 700 million years ago, there is a bit of debate, but really little emerged .
Most of the time life existed on Earth it was bacterial life, but at least Mars had time for bacterial life to arise, but if in the end we discover that there was never life on Mars it would be almost as important news as discovering it because it would mean that then in the recipe of life we are missing something or something happened on Earth that did not happen on Mars which would be quite strange.
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