Enlarge / Jezero crater shows clear signs of water-formed deposits, so it’s not a surprise to find water-altered material there.NASA/MSSS/USGS
Organic chemicals, primarily composed of carbon and hydrogen, underly all of life. They’re also widespread in the Universe, so they can’t be taken as a clear signature of the presence of life. That creates an annoying situation regarding the search for evidence of life on Mars, which clearly has some organic chemicals despite the harsh environment.
But we don’t know whether these are the right kinds of molecules to be indications of life. For the moment, we also lack the
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