For years, the motto among astrobiologists — people who look for life on distant worlds, and try to understand what life is, exactly — has been “follow the water.” You have to start the search somewhere, and scientists have started with liquid water because it’s the essential agent for all biochemistry on Earth.
Now they’ve followed the water to a small, icy moon orbiting Saturn. Scientists reported Thursday that Enceladus, a shiny world about 300 miles in diameter, has a subsurface “regional sea” with a rocky bottom.
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