Look into the rare earth hypothesis.
In a great number of solar systems that we observe, a large gas giant like Saturn will end up “crashing” down through the solar system toward the star taking out all of the smaller rocky planets between it and it’s eventual final orbit. Our solar system just so happens to have 2 of them right next to each other to prevent this “crashing” down effect and keep them in a stable orbit far out from the sun. They also protect the inner planets from debris coming in from outside the solar system.
The earth has a comparatively enormous moon to similar planets as the result of a previous impact. In addition to protecting us from impacts, it more importantly creates tides. Tidal pools are likely where the first life began. Without the ancient impact and resulting huge moon creating tides, there may be no life on earth.
These both seem like pretty unique circumstances.
I don’t think it is a “gimme” that there is life all over the universe. In fact, I might be inclined to believe that we are the only place.
Maybe. Maybe not.
It's been theorized, but not proven. I'm not even sure it's possible, much less likely.
the rare earth hypothesis
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Your comment portrays the consensus theory, not the scientific facts.
This solar system is an outlier, an anomaly - all other systems found have the large planets close to the sun. Earth-sized planets are their moons. See: The Saturn Myth/The Electric Universe.
The Earth’s Moon according to some tests of Lunar rocks is about a billion years older then the solar system. There is no proven origin for the moon, nor explanation for its size and composition.