The stars that have the longest lifetimes are
A) K and M stars.
B) A and F stars
C) G and K stars.
D) O and B stars.
Correct Answer:
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Q78: All stars on the main sequence
A) are
Q79: After a star becomes a red giant,hydrogen
Q80: Over which of the following stages of
Q81: Which of the following stars are metal-poor?
A)
Q82: The physical process believed to provide the
Q84: The event that follows the asymptotic giant
Q85: What kind of star is our Sun?
A)
Q86: Planetary nebulae are so-named because
A) these extended
Q87: A planetary nebula is
A) the spherical cloud
Q88: Over time,the turnoff point (the upper end
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