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I'm convinced life is common in the universe. Intelligent life is probably less common though. Only one species of life on earth is classified as intelligent life, and that came about by chance really. Some primates moved out of the jungle and onto the savannas where it was to their advantage to stand up to see. That led to an evolutionary change. Then they started to scavenge for meat, and that led to a more nutritious diet, which led to another evolutionary leap that increased brain size and intelligence. Since humans were bipedal and slower than other predators, they had to rely more on their wits, and that led to an even a greater increase in brain size, and the ability to develop weapons for better hunting.
Odds are, most planets that have life on them are probably primitive life, but considering the vastness of the universe, even if one out of 10,000 planets that have liquid water and an atmosphere were to have intelligent life, that would mean hundreds, if not thousands of planets have intelligent life just in our galaxy alone.
Considering there are around 400 billion stars in our galaxy, I am sure at least a billion of them have a planet orbiting that has liquid water.
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