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Q4: Virtually the entire disk of the Galaxy
Q20: Even if a probe were in a
Q21: From the best current data, we infer
Q26: Which of these does NOT depend on
Q39: As a radio source, the period of
Q53: If the density of the universe is
Q58: What is the primary determinant of whether
Q92: images of galactic clusters reveal large amounts
Q112: Is the Hubble constant really constant?
Q161: Quasars are the brightest objects in the