A tiny density, p ~ 10−26 kg m−3, and light output, J ~ 10−39 W m−3;
A curious “chemical” composition (Table 1.1) with most particles being cold photons or neutrinos and most energy being in the form of ordinary “baryonic” matter (protons and nuclei plus electrons), and not-so-ordinary “cold dark matter” and an effective vacuum energy or cosmological constant.
A non-equilibrium thermal state characterized by different temperatures for photons and neutrinos and a deficit of highly bound heavy nuclei.
A hierarchy of gravitationally bound structures ranging from planets and stars to galaxies and clusters of galaxies.
KeywordsDust Microwave Anisotropy Recombination Helium
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