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twoodfin 4 days ago

I can’t vouch for its scientific plausibility, but one of my favorite bullets to add to this list comes from Frank Robinson’s novel-length scifi exploration of the plausibility of extraterrestrial life:

“The next step is crucial. The simple organic molecules have to be shielded from the ultraviolet radiation of the primary. That requires a large body of water—an ocean—to protect them. No protection and the molecules break up as soon as they're formed. And oceans of water are … extremely rare.”

“But something else is rarer still. The next step in the creation of life is when the amino acids form into long chains.

Left in the ocean, they drift apart as easily as they join together. There has to be a means of concentrating them. Once a certain level of concentration is reached, they'll form long chains, more complex molecules, automatically. Heating isolated bodies of water would help, say tidal pools warmed by hot lava and occasionally replenished by the sea.”

“Do you understand, Sparrow? Tidal pools implies tides and that means a moon large enough to raise them—though not too frequently, because you might dilute the pool too much. A combination of the primary and the moon would raise larger tides less often, and that would be a happy medium. What's required, then, is a planet that has land surfaces, oceans, and a large enough satellite to raise suitable tides. The action would concentrate the simple amino acids and they could combine into the longer chains.”

The novel is The Dark Beyond the Stars, and I recommend it highly.

defrost 4 days ago | parent [-]

I first read that same argument when I was twelve or so way back in the day in The Tragedy of the Moon (1973), a collection of nonfiction science essays by Isaac Asimov.