The _______________ time is the amount of time it took light to travel from a celestial object to Earth.
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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
Q55: _ are objects of known luminosity used
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
Q61: Gentle tidal interactions are probably necessary to
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