Question: what is the difference between a giant star and a supergiant star?
Answer: What is the difference between a giant star and a supergiant star? Giant stars have radii between 10 and 100 solar radii and luminosities between 10 and 1,000 times that of the Sun. Whereas Supergiants have radii between 30 and 1,000 solar radii and luminosities between 30,000 and 100,000 times that of the Sun.