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Gravitation, Cosmology, and Cosmic-Ray Physics (1986) / Chapter Skim
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III. Cosmology
Pages 83-86

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From page 83...
... III Cosmology
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From page 85...
... A second feature of cosmology that endows it with fundamental importance as a field of physics is the fact that the properties of matter are studied under the most extreme conditions, from the unimaginable densities and temperatures of the early universe to the near-perfect vacuum of intergalactic space. By comparison, experimenters in terrestrial laboratories can only test our physical theories over a narrow region of their supposed range of validity.
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From page 86...
... Equally exciting is our rapidly growing knowledge of the local universe, out to say 108 light years. Major advances in astronomical instrumentation and data-processing techniques have led to more detailed studies of the physics of galaxies and clusters of galaxiesdata vital to understanding the origin and evolution of these basic elements of our universe.
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Key Terms

  • physical theories
  • intergalactic space
  • particle physics
  • earlier times
  • local universe

  • basic elements
  • unimaginable densities
  • galaxiesdata vital
  • difficulty arises
  • astronomical instrumentation

  • equally exciting
  • growing knowledge
  • supposed range
  • additional difficulty
  • particularly critical

  • major advances
  • uncertainties introduced
  • detailed studies
  • physics comes
  • terrestrial laboratories

  • extreme conditions
  • cosmological laboratories
  • fundamental importance
  • narrow region
  • particular property

  • relic nuclei
  • galactic nuclei
  • rapidly growing
  • microwave background
  • basic phenomena


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