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There was an Asimov essay on other possible chemistries of life that I read years ago http://www.bigear.org/CSMO/HTML/CS09/cs09p05.htm …
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In order of descending temperature: 1. fluorosilicone in fluorosilicone 2. fluorocarbon in sulfur 3.*nucleic acid/protein (O) in water 4. nucleic acid/protein (N) in ammonia 5. lipid in methane 6. lipid in hydrogen
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You surprised me here. I always assumed DNA was just one of possibilities. These experiments suggest that indeed there are other possibilities: [1] https://en.wikipedia.org/wiki/Base_pair#Unnatural_base_pair_(UBP) … [2]https://en.wikipedia.org/wiki/Hachimoji_DNA …
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DNA is probably a local maximum in some "design space", and there are probably other local maxima. That on Earth we have DNA and not something else might have been influenced by: - elemental composition of Earth - temperature - radiation intensity - surface gravity (via pressure)
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