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" ... Europe and Japan’s BepiColombo spacecraft has successfully completed a flyby of Venus on its way to Mercury – which included an effort to look for phosphine, a possible biosignature, in the atmosphere. ... "
" ... Even if pi Earth doesn’t yield a biosignature which signals the presence of life, it’s a valuable discovery in the work toward gaining a better understanding of our universe. ... "
" ... On an inhabited planet like the early Earth, which had negligible atmospheric oxygen but a microbial biosphere, we can look for carbon dioxide, relatively abundant methane, and an absence of carbon monoxide, says Catling. On such a planet, microbes would release methane, but the carbon monoxide would get eaten by the microbes, says Catling, making this a “combo biosignature.” ... "
" ... To that end, Cuntz says that the confirmation of a bonafide biosignature from an alien moon will likely be due to the detection of macromolecules that can’t be explained by non-biological processes. Or an atmospheric imbalance (or disequilibria) of molecules that to the best of our knowledge can’t be created by non-biological processes. Or finally, seasonal variations of surface features on one of these moons that can’t be explained by non-biological processes. ... "