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Q3: What observations suggest the mass of the
Q6: A possible evolutionary sequence is quasar to
Q11: Most of the new star formation in
Q42: What is true of galaxies at the
Q52: Shapley's measurements of the distances to open
Q67: Why do spirals seem to be more
Q67: The nearest comparable galaxy to our own
Q79: Mapping the intracluster gas is best done
Q128: Within the boundaries of the constellations Coma
Q129: How does Hubble's law relate cosmological redshift