Cosmic Background: Measurements of the Spectrum

  • P. E. Clegg
Part of the NATO Advanced Study Institutes Series book series (ASIC, volume 38)


Assume the existence of Planckian relict radiation at a present temperature of ∿2.9 K.
  • Reasonable assumptions about the matter density of the universe lead to the conclusion that the photons now entering radiometer horns or spectrometers last interacted with matter at a redshift of ∿1500, i.e. only ∿200,000 y after the “origin” of the universe.

  • In contrast, redshifts of visually identified objects in the universe are ≲4 corresponding to epoch ∿109 y after creation. Antiquity of the relict radiation therefore provides a unique opportunity of direct investigation of the early universe.


Michelson Interferometer Early Epoch Cosmic Background Antenna Temperature Queen Mary College 
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Copyright information

© D. Reidel Publishing Company, Dordrecht, Holland 1978

Authors and Affiliations

  • P. E. Clegg
    • 1
  1. 1.Queen Mary CollegeUniversity of LondonEngland

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