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Most of the energy we use can be traced to the Sun in one way or another, but not all of it. Energy from nuclear sources does not come from the Sun. It comes from the heat produced as a result of decay of radioactive isotopes.

While the Sun does create radioactive isotopes in its interior, that is not the source of the isotopes available to us on the Earth today. Our radioactive isotopes came from other stars that exploded billions of years ago, before the Earth and the Sun were formed.

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14y ago

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