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psymunn t1_j6ba17n wrote

Reply to comment by LaRoara42 in Shouldn't goldilocks zones shift over time? by LaRoara42

I never understood what would be more fascinating about life originating on another planet rather than earth. It just passes the buck. Also it doesn't explain the rest of the biodiversity we have here

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LaRoara42 OP t1_j6bg7g3 wrote

It's more like humans feel sorta...out of place.

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haysoos2 t1_j6bp1f2 wrote

Not really. Our entire biology and fossil history fits with the diversity of life in Earth.

As multicellular, deuterostome, bilateral, chordate vertebrates, osteichthyans, sarcoptergyians, tetrapods, synapsids, mammals, eutherians, primates, cercopithicoids, hominoids and hominids we have an entire branching and interlinked family history with all of the other life that shares our planet.

For any of that to make sense, that shared history would also have to be extraterrestrial, making the introduction billions of years ago at the very beginning of cellular life, and as such just adds more questions without actually answering anything.

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