The mass of a galaxy can be determined from its _______________ curve.
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Q54: Gravitational lensing is caused by _.
A) refraction
Q55: _ are objects of known luminosity used
Q56: The _ time is the amount of
Q57: The Milky Way and other spiral galaxies
Q58: Because the Hubble constant has a value
Q60: Hot, low-density gas can be detected in
Q61: Gentle tidal interactions are probably necessary to
Q62: Why are methods to determine the distances
Q63: Is dark matter important in other galaxies
Q64: A galaxy that has created a large
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