The Tully-Fisher relationship relies on broadening of the 21-cm radio line in distant spiral galaxies.What causes this broadening?
A) Thermal motion of the gases in the galaxy
B) Random motions of the stars in the galaxy
C) The rotation of the galaxy
D) The general expansion of the universe (Hubble flow)
Correct Answer:
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Q43: The following distance-measuring techniques,arranged in order of
Q44: Which of the following statements is NOT
Q45: The largest galaxies in the universe come
Q46: Which of the following techniques are NOT
Q47: How are galaxies spread throughout the universe?
A)
Q49: What is the Local Group?
A) A group
Q50: Which of the following types of galaxies
Q51: The Tully-Fisher relation provides a method of
Q52: To an astronomer,what is a "standard candle"?
A)
Q53: Are there types of galaxies in which
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