A) Both. Surprised? See
http://www.redorbit.com/news/science/2080331/half_of_earths_internal_heat_comes_from_radioactive_decay/
Radioactive decay is a nuclear process that is important for the release of energy in the earth's core. In the case of the sun, the energy comes from nuclear fusion of hydrogen into helium.
Which of these two bodies gets its internal heat from nuclear processes? A) Both.B) Sun.C) Neither.D) Earth.
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