Chris McKay of NASA’s Ames Research Center says three outer solar system moons (below, not to scale) are prime candidates for alien life because they fulfill some of the key criteria for habitability: liquid water, organics (aka carbon-containing compounds), nitrogen and an energy source.
Credit: From Left: Galileo Project, JPL, NASA, reprocessed by Ted Stryk; NASA, JPL, Space Science Institute; NASA, JPL, Space Science Institute
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