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theadvancedapes · 4383 days ago · link · · parent · post: Did Curiosity Discover Life? My Prediction.
I think it is also important to consider the possibility that microbial life is very common, but complex organisms are very, very rare. For 1.5 billion years life on Earth was nothing but unicellular organisms. It was a gigantic evolutionary leap to go from unicellular to multicellular organisms. The conditions need to be just right for billions of years. On top of that, there have been literally trillions of multicellular organisms and only one of them has the capacity to understand the universe in the way we do.