One of Jupiter's moons, Io, pictured above, is the solar system's most volcanically active body. The surface of Io is constantly being formed and reformed by lava. Io lacks craters, which indicates that the lava flow is so consistent that craters don't have time to form and remain before they are covered by lava. Astronomers speculate that strong tides are what cause Io's volcanic activity. Space seems like something that stays constant and unchanging because usually when discussing geological or universal time we talk in millions or billions of years. The fact that Io changes so constantly makes it a universal anomaly.
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