_______________ are objects of known luminosity used for finding distances.
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Q50: _ galaxies have star formation, but no
Q51: Galactic collisions _.
A) are very rare, since
Q52: Galactic _ describes the process of a
Q53: Spiral structures and steady star formation depend
Q54: Gravitational lensing is caused by _.
A) refraction
Q56: The _ time is the amount of
Q57: The Milky Way and other spiral galaxies
Q58: Because the Hubble constant has a value
Q59: The mass of a galaxy can be
Q60: Hot, low-density gas can be detected in
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