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Scientists question possible signs of life on exoplanet K2-18b in new study: 'We never saw more than insignificant hints'
Possible signs of alien life found on nearby exoplanet, study reports
Possible signs of Mars life: Astrobiologist explains Perseverance rover's exciting find
Mars rover found a rock with possible signs of ancient life
NASA says it found possible signs of life on Mars. There are a lot of maybes
NASA's Perseverance Mars rover finds possible signs of ancient Red Planet life
