Which of the following statements comparing halo stars to our Sun is not true?
a. Most stars in the halo have cooler surface temperatures than the Sun.
b. Most stars in the halo are less luminous than the Sun.
c. Most stars in the halo contain a much lower percentage of heavy elements than the Sun.
d. Most stars in the halo have either died or are in their final stages of life, while the Sun is only in about the middle of its lifetime.
