How does the weak force power the Sun?
Quick Answer
The weak force lets protons convert into neutrons in the Sun’s fusion chain, starting the process that builds helium from hydrogen. Without it, the Sun could not shine the way it does.
The Full Story
Inside the Sun’s core, hydrogen nuclei fuse through a sequence of reactions called the proton-proton chain. The first step requires the weak force, which allows one proton to change into a neutron, producing deuterium and releasing a positron and a neutrino. That weak interaction is rare, but it is crucial because it sets the pace of the Sun’s energy production. The Sun has been shining for about 4.6 billion years because nuclear fusion steadily converts mass into energy. Neutrinos from these reactions were later detected on Earth, confirming key parts of the model.
Key Facts
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