The presence of phosphine in Venus's thick atmosphere has revived the age-old question: Are we alone?
NASA's Mars Curiosity rover has discovered high levels of manganese oxides in Martian rocks, which may indicate that the red planet was once more Earth-like than previously believed.
National Aeronautics and Space Administration's Mars rover Curiosity has made the first definitive detection of organic molecules, the building blocks of all known forms of terrestrial life, on the surface of the Red Planet.
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