All of the observable Universe is filled with photons that were created during the Big Bang, which is known as the cosmic microwave background radiation (CMBR). There is quite likely a correspondingly large number of neutrinos called the cosmic neutrino background. The current black body temperature of this photon radiation is about 3 K (−270 °C; −454 °F). Some regions of outer space can contain highly energetic particles that have a much higher temperature than the CMB.
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