"In a sense, all of Earth glows in the dark. The energy release from natural radioactivity, the lingering fluorescence of stellar explosions, keeps Earth dynamic. It melts the core and keeps it flowing, and heats the crust and mantle, with consequences ranging from the generation of earth's magnetic field to earthquakes and the motion of continents. By contrast, Luna and Mars, because they are smaller, derive less energy from radioactive decays. Geologically, they are dead."
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Academics from the United StatesNobel laureates in PhysicsMathematicians from the United StatesAgnostics from the United StatesPhysicists from the United States
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Frank Wilczek
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