This line of reasoning is illogical and dangerous. Just because we have looked, but have not succeeded in finding any intelligent life does not mean that it probably doesn't exist. Scientists have estimated that the entire visible horizon is approximately 30-160 billion light years across. That means if you could travel at the speed of light, you would have to live many times longer than Earth's current age to even skim a portion of the universe. This goes to show how difficult of a problem it is to "look" for intelligent life versus the limitations of our cutting edge technology in tackling this problem.
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This line of reasoning is illogical and dangerous. Just because we have looked, but have not succeeded in finding any intelligent life does not mean that it probably doesn't exist. Scientists have estimated that the entire visible horizon is approximately 30-160 billion light years across. That means if you could travel at the speed of light, you would have to live many times longer than Earth's current age to even skim a portion of the universe. This goes to show how difficult of a problem it is to "look" for intelligent life versus the limitations of our cutting edge technology in tackling this problem.