The star Aldebaran is a red giant, and is much more luminous than the Sun. What conclusions can be drawn from this fact?
A. In the H-R diagram, Aldebaran is above and to the left of the Sun.
B. Aldebaran is cooler than the Sun, but has larger diameter than the Sun.
C. Aldebaran is a binary star.
D. Aldebaran is hotter and much more massive than the Sun.
E. None of these choices is correct.
Answer: B
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Indicate whether the statement is true or false