What is the reference that astronomers use to denote the luminosity of stars?
A) The luminosity of the Sun
B) The luminosity of the Northern Star
C) The luminosity of Proxima Centauri, our solar system's closest neighbor star
D) The luminosity of the cluster of stars at the center of the Milky Way galaxy
Correct Answer:
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Q8: We do not see stars in the
Q12: The star nearest the Earth is
A)the Sun.
B)Alpha
Q13: Which best describes the intrinsic motion of
Q14: How far is a light year?
A)Nearly 10
Q20: The diurnal rotation of the stars refers
Q22: The temperature of a star is evidenced
Q24: Luminosity is
A)the total amount of light energy
Q28: A star's color tells us
A)how much energy
Q34: A star's luminosity tells us
A)how much energy
Q39: What are the outward forces that act
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