Cosmology Concepts 25-39
15 entries in the Cosmology Concepts compendium.
Observational cosmologyStudy of the universe through observation and measurement.Particle horizonBoundary between observable and unobservable regions of the universe.Photon epochEpoch when photons dominated the early universe's energy.Physical cosmologyStudy of the universe's origin, structure, and evolution.Primordial fluctuationsDensity variations seeding all cosmic structure.Quark epochEarly universe period when quarks existed freely in a plasma.Recombination (cosmology)Epoch when electrons and protons first formed neutral hydrogen atoms.RedshiftRedshift measures the stretching of light from moving or distant sources.ReionizationReionization transformed neutral hydrogen into ionized plasma after the Dark Ages.Scale factor (cosmology)Dimensionless parameter describing the expansion of the universe.Shape of the universeThe universe's shape involves local curvature and unknown global topology.Steady-state modelA now-rejected cosmological model with continuous matter creation.Structure formationProcess creating galaxies and voids from density ripples.Ultimate fate of the universeScientific hypotheses predict the universe's possible end.UniverseThe totality of all space, time, matter, and energy.
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