The presence of elements heavier than helium in stars is very important because
A) they provide the raw materials for the formation of planets and life
B) without them they could not form
C) they help stabilize their interiors
D) they are responsible for the fusion reactions at their centers
Correct Answer:
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Q4: When a star finally runs out of
Q5: The intrinsic brightness of a star is
Q6: M-type stars in our galaxy are
A) fairly
Q7: A star less massive than our Sun
A)
Q8: Stars are mostly made of
A) hydrogen and
Q10: What is the most common class of
Q11: What is the minimum possible mass for
Q12: The most important property of a star
Q13: The color of a star is a
Q14: What proportion of their lives do stars
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