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Q2: If you were to take a voyage
Q28: In 1924, Edwin Hubble proved that the
Q51: When we measure the broadening of absorption
Q66: "Beauty" in Astronomy: In the absence of
Q87: Some potential MACHOs (massive compact halo objects)
Q97: What produces the 21-cm radio line that
Q104: Which group represents stars that are hot
Q122: What happens when a main-sequence star exhausts
Q128: Which is brighter in our sky, a
Q147: Although the entire universe may be much