As a result of the big bang there is, in addition to the microwave background radiation, a uniform distribution of background:

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The Big Bang is theorized to have produced a vast number of neutrinos in addition to the cosmic microwave background radiation. These neutrinos, much like the microwave background radiation, would be uniformly distributed across the universe, making them a cosmic neutrino background. Unlike electrons, quarks, gluons, or atoms, neutrinos interact very weakly with matter, making them difficult to detect but theoretically pervasive throughout the cosmos.

As a Result of the Big Bang There Is, in Addition