New discoveries about icy moons in the outer solar system have raised exciting
possibilities for life beyond Earth.
Earlier this month, researchers made two big announcements: Saturn's moon Enceladus likely harbors hot springs, and Jupiter's huge satellite Ganymede apparently possesses a subsurface ocean that may contain more water than all of Earth does.
However, while the discovery makes Enceladus, which also has a subsurface ocean, even more intriguing to astrobiologists, Ganymede is still not a great bet for alien life, researchers say. [6 Most Likely Places for Alien Life in the Solar System]
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