Abstract
Most astronomers and physicists now believe that we live in an expanding universe that evolved from an early state of extremely high density and temperature. Measurements of the spectrum and anisotropy of the cosmic microwave background radiation (CMBR) provide strong evidence supporting this picture. Today, the spectrum of the CMBR matches that of a 2.728 K blackbody to within 0.01%, and the radiation is highly isotropic on the sky. Both of these properties are expected of the thermal radiation remnant of a hot, dense early universe (Peebles, 1993).
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