Posted by Jim on Saturday, March 24, 2012 at 9:44pm.
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.
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