NOTE: This and the following web pages contain a database of short essays from the Astronomy and Astrophysics Encyclopedia, ed. Stephen P. Maran. They are updated weekly. This work is part of a new effort in parallel with NED (NASA/IPAC Extragalactic Database) and, among contributions from the authors listed below, makes use of NASA's Astrophysics Data System Abstract Service.

  1. Antonucci, Robert. Active Galaxies and Quasistellar Objects, Blazers
  2. Barnes, Joshua E. Galaxies, Disk, Evolution
  3. Barrow, John D. Cosmology, Theories
  4. Barthel, Peter. Active Galaxies and Quasistellar Objects, Interrelations of Various Types
  5. Baum, William A. Galaxies, Elliptical
  6. Bekenstein, Jacob D. Gravitational Theories
  7. Bertschinger, Edmund. Dark Matter, Cosmological
  8. Binggeli, Bruno. Virgo Cluster
  9. Blandford, Roger D. Active Galaxies and Quasistellar Objects, Accretion
  10. Boldt, Elihu. Background Radiation, X-Ray
  11. Bothun, Gregory D. Protogalaxies
  12. Boughn, Stephen P. Gravitational Radiation
  13. Bowyer, Stuart Background Radiation, Ultraviolet
  14. Brandenberger, Robert H. Cosmology, Inflationary Universe
  15. Carlberg, Ray. Galaxies, Spiral, Nature of Spiral Arms
  16. Carr, Bernard J. Cosmology, Population III
  17. Clayton, Donald D. Cosmology, Cosmochronology
  18. Cohen, Marshall H. Active Galaxies and Quasisitellar Objects, Superluminal Motion
  19. Cudworth, Kyle M. Galatic Structure, Globular Clusters
  20. Deguchi, Shuji. Masers, Interstellar and Circumstellar
  21. Dressler, Alan. Galaxies, Properties in Relation to Environment
  22. Eilek, Jean A. Active Galaxies and Quasistellar Objects, Jets
  23. Elmegreen, Bruce G. and Elmegreen, Debra Meloy. Galaxies, Spiral, Structure
  24. Elitzur, Moshe. Masers, Interstellar and Circumstellar, Theory
  25. Evans, Lloyd T. Stars, Cepheid Variable
  26. Fabbiano, Giuseppina. Galaxies, X-Ray Emission
  27. Fairall, Anthony P. Superclusters, Observed Properties
  28. Fichtel, Carl E. Background Radiation, Gamma Ray
  29. Giovanelli, Riccardo. Clusters of Galaxies, Radio Observations