Sirius is a star with spectral type A star and Rigel is a star with spectral type B star. What can we conclude?
A. Rigel has a higher core temperature than Sirius.
B. Sirius has a higher core temperature than Rigel.
C. Rigel has a higher surface temperature than Sirius.
D. Sirius has a higher surface temperature than Rigel.
Answer:C
Sirius is a star with spectral type A star and Rigel is a star with spectral type B star. What can we conclude?
A. Rigel has a higher core temperature than Sirius. B. Sirius has a higher core temperature than Rigel. C. Rigel has a higher surface temperature than Sirius. D. Sirius has a higher surface temperature than Rigel.