NASA's Cassini spacecraft discovered that Saturn's small moon Enceladus, just 500 km across, is geologically active despite scientists initially expecting it to be a dead block of ice, demonstrating that even small celestial bodies can exhibit surprising geological activity.
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The Hidden Water of Europa and Ganymede π§Added:
Over at Saturn, another revolution. The Cassini spacecraft was studying Saturn's moons when it focused on tiny Enceladus, a moon just 500 km across. Scientists expected a dead block of ice. What they found was a world that was shockingly alive.
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