When astronomers use Hubble's law to measure the distance to a galaxy they have to measure the ______ of the galaxy.
A) mass
B) luminosity
C) recessional speed
D) rotational speed
Correct Answer:
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Q3: The study of the structure and evolution
Q4: _ provides experimental evidence that the Universe
Q5: The inverse of Hubble's constant (1/H) gives
Q6: According to the present estimates, the Universe
Q7: The Cosmological Principle states that
A) the Universe
Q9: Why does the observation that all distant
Q10: How do astronomers estimate the approximate age
Q11: Suppose the Hubble constant turned out to
Q12: Dividing the separation of two galaxies by
Q13: When astronomers look at distant galaxies, what
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