CONCEPTS of the size and geometry of our observable universe depend largely on what we make of the mysterious, distant quasistellar objects. Seyfert galaxies, which have a bright nucleus at the center of an otherwise normal galaxy, have been another source of mystery. Observations of their optical and radio emissions show fluctuations. If we can find a relation between quasistellar objects and Seyfert galaxies, suggesting a similar origin and an evolutionary link, we may be able to use the fluctuating emission as a new yardstick for the universe.
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© 1969 American Institute of Physics.
1969
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