Stellar physics
5 questions tagged Stellar physics — spanning every one of the seven Ws.
Whose proposal explained why the Sun shines?
Hans Bethe explained that the Sun shines because of nuclear fusion in its core. His work in 1938 identified the chain of reactions that power stars like the Sun.
Why do some stars appear red or orange instead of white or blue?
A star’s color mainly depends on its surface temperature. Cooler stars peak at red or orange wavelengths, while hotter stars look white or blue.
Which force is primarily responsible for the structure of stars through hydrostatic equilibrium?
Gravity is the force that compresses stars, while pressure from nuclear fusion and radiation pushes outward. The balance between them creates hydrostatic equilibrium.
Whose theory explained why the Sun and stars shine by nuclear fusion?
Hans Bethe explained stellar energy generation in 1938. He showed that nuclear fusion powers the Sun and other stars.
Whose calculations first explained the source of the Sun’s energy as nuclear fusion?
Hans Bethe explained in 1939 how stars, including the Sun, produce energy by nuclear fusion. His work identified the proton-proton chain and carbon-nitrogen-oxygen cycle.