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Cosmology: The History and Nature of Our UniverseThe most familiar constituents of the universe are atomic matter and light; neutrinos make up another component; 96 percent of the universe is dark energy and dark matter; the relative amounts of these constituents changes as the universe expands.

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Now PlayingCosmology: The History and Nature of Our UniverseThe most familiar constituents of the universe are atomic matter and light; neutrinos make up another component; 96 percent of the universe is dark energy and dark matter; the relative amounts of these constituents changes as the universe expands.0Cosmology: The History and Nature of Our UniverseTaking a trip through the universal timeline from the big bang to a future of ever-accelerating expansion; the eight key stages between them include the condensation of atoms, the birth of the first stars and the formation of galaxies.