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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Q28: A star's color tells us
A)how much energy
Q29: Which is greater,the gravitational attraction between a
Q30: The stars Procyon and Betelgeuse both appear
Q31: The masses of stars are found by
Q32: Most white dwarfs
A)have relatively hot surfaces.
B)have relatively
Q34: A star's luminosity tells us
A)how much energy
Q35: The H-R Diagram,an important tool of astronomers,relates
Q36: Stars to the lower left of the
Q37: The longest living stars are those of
A)low
Q38: Why does a star's color corresponds to
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