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The cosmic background radiation comes from a time in the evolution of the universe   a. when protons and neutrons were first formed.   b. when the big bang first began to expand.   c. that is known as the inflationary period.   d. when gamma rays had enough energy to destroy nuclei.   e. when electrons began to recombine with nuclei to form atoms.

The cosmic background radiation comes from a time in the evolution of the universe   a. when protons and neutrons were first formed.   b. when the big bang first began to expand.   c. that is known as the inflationary period.   d. when gamma rays had enough energy to destroy nuclei.   e. when electrons began to recombine with nuclei to form atoms.

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The cosmic background radiation comes from a time in the evolution of the universe
  a.
when protons and neutrons were first formed.
  b.
when the big bang first began to expand.
  c.
that is known as the inflationary period.
  d.
when gamma rays had enough energy to destroy nuclei.
  e.
when electrons began to recombine with nuclei to form atoms.
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