Venus, but for some quirk of planetary evolution, could have been Earth or vice versa.
by a larger group led by Seager experimentally explores whether key molecules for life can survive in sulfuric acid; thepaper mentioned above examines and addresses the arguments against Venusian habitability.
To test whether nucleic bases can remain stable in sulfuric acid, the researchers… well, put a bunch of nucleic bases in sulfuric acid of concentrations between 81 and 98 percent, with the remainder being water. So did purine and pyrimidine, as well as a compound called 2,6-diaminopurine, which is used as a genetic base substitute for adenine by some. This means that, theoretically, at least, the same nucleic bases could hang around quite happily in the sulfuric acid clouds of Venus.
"Our findings show that complex organic chemistry, including DNA nucleic acid bases, can be stable in concentrated sulfuric acid and motivates us to design missions that directly probe the cloud particles for the presence of organic material,"In the second paper, the team breaks down arguments against the possibility of life, focusing heavily on whether the features of Venus's clouds and atmosphere make the prospect of life vanishingly improbable.
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