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Nuclear fusion of hydrogen into helium powers stars, but fusion requires a lot of energy. Where does this energy come from? | Astronomy.com
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  • Nuclear fusion of hydrogen into helium powers stars, but fusion requires a lot of energy. Where does this energy come from?
FROM THE November 2014 ISSUE

Nuclear fusion of hydrogen into helium powers stars, but fusion requires a lot of energy. Where does this energy come from?

Solomon Agbahowe, Benin City, Nigeria
Published: Monday, September 29, 2014
RELATED TOPICS: SPACE PHYSICS
The Sun's core
You’re in good company: This question also stumped the physicists who first tried to understand nuclear fusion in stars.

In a star’s core, all atomic nuclei have been separated from their electrons, so each hydrogen atom is really just a proton and thus holds a positive charge. The positive charges repel, and without some external force pushing on those protons, they will not get close enough to join.

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