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At the risk of self-plagiarism: (https://physics.stackexchange.com/a/532568/43351 with a bit added). Molecular chemistry in the early universe requires species with bound electrons. Helium hydride is the first molecule to form because neutral helium atoms, formed about 120,000 years after the big bang, could combine with plentiful protons; but it was another ...


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It is indeed a much more interesting cocktail of chemicals. Before plunging into Saturn, Cassini collected some invaluable data about composition of its atmosphere and how the complex ring system works. Cassini experienced some "heavy ring rains" in Saturn's innermost D ring, which turns out to be dust grains. The probe tried to use the Ion and ...


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