Poll: What do you believe about extraterrestrial life?
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Depends what you mean by common. Common as an absolute number in the universe or common in our local neighborhood?
Here is a post on what ingredient is rarest for life to come into being and sustain its presence on a planet.
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Life is likely common coz it occurred so so quickly. Intelligent life is rare coz it took so long to occur and did so only once. No other species came close. Think about the fact that other than hominids no other species ever tamed fire. And we did it millions of years ago.
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In an infinite universe, the words rare and common have no meaning. I believe life in the universe is both rare and common depending on scale.
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I think Hanson's Grabby Alien modeling is the best science we have right now,
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Apparently life on Earth started soon after the Moon impact (maybe only a few tens of millions of years) but complex multicellular organisms came billions of years later. Which suggests more planets ruled by bacteria than anal-probing saucer pilots.
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