2 ms·
The Cosmic Microwave Background (CMB) has ~420 photons/cm^3 each with 24 meV, so about 10 MeV/m^3. The Cosmic neutrino Background (CvB) has ~340 neutrinos/cm^3
by mikhailfranco 9y ago
The Cosmic Microwave Background (CMB) has ~420 photons/cm^3 each with 24 meV, so about 10 MeV/m^3.
The Cosmic neutrino Background (CvB) has ~340 neutrinos/cm^3 each with 50 meV, so about 17 MeV/m^3.
As a comparison, the visible matter (baryon) density is estimated to be 1/5 protons/m^3, each with 940 MeV, so about 240 MeV/m^3.