Which of the following methods used to determine the mass of a cluster of galaxies does not depend on Newton's law of gravity?
A) measuring the amount of distortion caused by a gravitational lens
B) measuring the temperature of X- ray gas in the intracluster medium
C) measuring the orbital velocities of galaxies in the cluster
D) none of the above
Correct Answer:
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Q20: Compared to the critical density of matter,
Q21: When we say that a cluster of
Q22: A mass- to- light ratio for a
Q23: Refer to this scenario for the following
Q24: Why can't the dark matter in galaxies
Q26: Visible, luminous matter (such as the stars
Q27: Measuring the amount of deuterium in the
Q28: Why does the temperature of the gas
Q29: The quantity called the "enclosed mass" M(<r)represents
Q30: A gravitational lens occurs when
A)a massive object
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