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Natural satellites (moons) dissipate energy that either originates in the body's hot

core, or else has been previously absorbed from solar (sun) radiation.

Artificial earth satellites typically operate on-board electronics with electric power

from solar panels excited by the sun. They also use propellant carried at launch for

station-keeping thrusters, and may also carry nuclear reactors when the load will

exceed the available solar energy flux.

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14y ago

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