image credit: NASA/SOHO; image source; larger image
Fusion Basics
The sun's energy source is the fusion of protons into helium. To learn about this process, visit UCAR's Fusion Inside the Stars and Nick Strobel's The Sun's Power Source. For more on fusion, see Fusion Basics.
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Fusion in the Sun!
Explore the fusion chain reaction that powers the sun. You can vary the temperature and the hydrogen concentration as you watch the nuclear reactions occur.