Geography · The Sun
According to physicist Hans Bethe, what is the primary source of the Sun's energy?
- 1Nuclear fusion of hydrogen nuclei into a helium nucleus at the core✓
- 2Nuclear fission of heavy radioactive elements at the core
- 3Gravitational contraction and thermal expansion of gases
- 4Chemical combustion of hydrogen and carbon molecules
Correct answer
Nuclear fusion of hydrogen nuclei into a helium nucleus at the core
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