Why is a 1 solar-mass red giant more luminous than a 1 solar-mass main-sequence star?
A. The red giant has a hotter core.
B. The red giant's surface is hotter.
C. The red giant is more massive.
D. Fusion reactions are producing energy at a greater rate in the red giant.
Answer:D
Why is a 1 solar-mass red giant more luminous than a 1 solar-mass main-sequence star?
A. The red giant has a hotter core. B. The red giant's surface is hotter. C. The red giant is more massive. D. Fusion reactions are producing energy at a greater rate in the red giant.