- Q. Why is the sun yellow?
- A. Stars make light from nuclear fusion reactions of hydrogen into helium. Stars with more hydrogen fuel are very hot and blue in colour. Stars such as our sun are of a medium temperature (only 6000oC on the surface) and are yellow. Cooler stars are red.
- Q. Are all stars like our sun?
- A. No. Unlike the sun, 70% of all stars are double stars. Many blue stars are much hotter than our yellow sun, and many red stars are much cooler than our sun.