[{"n": "Accelerating expansion of the universe", "u": "/e/cosmology-concepts/accelerating-expansion-of-the-universe/", "s": "Discovery that the universe's expansion is speeding up, not slowing down."}, {"n": "Age of the universe", "u": "/e/cosmology-concepts/age-of-the-universe/", "s": "Age of the universe is 13.8 billion years."}, {"n": "Alpher–Bethe–Gamow paper", "u": "/e/cosmology-concepts/alpher-bethe-gamow-paper/", "s": "The αβγ paper linked the Big Bang to element formation."}, {"n": "Anthropic principle", "u": "/e/cosmology-concepts/anthropic-principle/", "s": "Observable universe must allow observers to exist."}, {"n": "Baryogenesis", "u": "/e/cosmology-concepts/baryogenesis/", "s": "Hypothesized process producing matter dominance over antimatter in the early universe."}, {"n": "Baryon acoustic oscillations", "u": "/e/cosmology-concepts/baryon-acoustic-oscillations/", "s": "Standard ruler from early universe sound waves."}, {"n": "Big Bang nucleosynthesis", "u": "/e/cosmology-concepts/big-bang-nucleosynthesis/", "s": "Model for light nuclei formation in the early universe."}, {"n": "Big Crunch", "u": "/e/cosmology-concepts/big-crunch/", "s": "A scenario where the universe collapses back to a singularity."}, {"n": "Big Rip", "u": "/e/cosmology-concepts/big-rip/", "s": "A model where dark energy tears apart all matter."}, {"n": "Chronology of the universe", "u": "/e/cosmology-concepts/chronology-of-the-universe/", "s": "Standard timeline of cosmic history from inflation to present."}, {"n": "Comoving and proper distances", "u": "/e/cosmology-concepts/comoving-and-proper-distances/", "s": "Two distance measures used in standard cosmology."}, {"n": "Cosmic neutrino background", "u": "/e/cosmology-concepts/cosmic-neutrino-background/", "s": "Relic neutrinos from one second after the Big Bang."}, {"n": "Cosmological horizon", "u": "/e/cosmology-concepts/cosmological-horizon/", "s": "Boundaries dividing observable from unobservable regions of the universe."}, {"n": "Cyclic model", "u": "/e/cosmology-concepts/cyclic-model/", "s": "Cyclic models propose an infinite series of cosmic expansions and contractions."}, {"n": "Discovery of cosmic microwave background radiation", "u": "/e/cosmology-concepts/discovery-of-cosmic-microwave-background-radiation/", "s": "The discovery of cosmic microwave background radiation reshaped modern physical cosmology."}, {"n": "Electroweak epoch", "u": "/e/cosmology-concepts/electroweak-epoch/", "s": "Epoch when electromagnetism and weak force were unified."}, {"n": "Expansion of the universe", "u": "/e/cosmology-concepts/expansion-of-the-universe/", "s": "The increase in distance between gravitationally unbound parts of the universe."}, {"n": "Grand unification epoch", "u": "/e/cosmology-concepts/grand-unification-epoch/", "s": "Early universe epoch unifying three fundamental forces."}, {"n": "Horizon problem", "u": "/e/cosmology-concepts/horizon-problem/", "s": "A cosmological fine-tuning problem in the Big Bang model."}, {"n": "Lambda-CDM model", "u": "/e/cosmology-concepts/lambda-cdm-model/", "s": "Standard cosmological model of dark energy and cold dark matter."}, {"n": "Missing baryon problem", "u": "/e/cosmology-concepts/missing-baryon-problem/", "s": "Missing baryons are baryonic matter not yet observed in the recent universe."}, {"n": "Multiverse", "u": "/e/cosmology-concepts/multiverse/", "s": "Hypothetical set of all universes, debated in science and philosophy."}, {"n": "Observational cosmology", "u": "/e/cosmology-concepts/observational-cosmology/", "s": "Study of the universe through observation and measurement."}, {"n": "Particle horizon", "u": "/e/cosmology-concepts/particle-horizon/", "s": "Boundary between observable and unobservable regions of the universe."}, {"n": "Photon epoch", "u": "/e/cosmology-concepts/photon-epoch/", "s": "Epoch when photons dominated the early universe's energy."}, {"n": "Physical cosmology", "u": "/e/cosmology-concepts/physical-cosmology/", "s": "Study of the universe's origin, structure, and evolution."}, {"n": "Primordial fluctuations", "u": "/e/cosmology-concepts/primordial-fluctuations/", "s": "Density variations seeding all cosmic structure."}, {"n": "Quark epoch", "u": "/e/cosmology-concepts/quark-epoch/", "s": "Early universe period when quarks existed freely in a plasma."}, {"n": "Recombination (cosmology)", "u": "/e/cosmology-concepts/recombination-cosmology/", "s": "Epoch when electrons and protons first formed neutral hydrogen atoms."}, {"n": "Redshift", "u": "/e/cosmology-concepts/redshift/", "s": "Redshift measures the stretching of light from moving or distant sources."}, {"n": "Reionization", "u": "/e/cosmology-concepts/reionization/", "s": "Reionization transformed neutral hydrogen into ionized plasma after the Dark Ages."}, {"n": "Scale factor (cosmology)", "u": "/e/cosmology-concepts/scale-factor-cosmology/", "s": "Dimensionless parameter describing the expansion of the universe."}, {"n": "Shape of the universe", "u": "/e/cosmology-concepts/shape-of-the-universe/", "s": "The universe's shape involves local curvature and unknown global topology."}, {"n": "Steady-state model", "u": "/e/cosmology-concepts/steady-state-model/", "s": "A now-rejected cosmological model with continuous matter creation."}, {"n": "Structure formation", "u": "/e/cosmology-concepts/structure-formation/", "s": "Process creating galaxies and voids from density ripples."}, {"n": "Ultimate fate of the universe", "u": "/e/cosmology-concepts/ultimate-fate-of-the-universe/", "s": "Scientific hypotheses predict the universe's possible end."}, {"n": "Universe", "u": "/e/cosmology-concepts/universe/", "s": "The totality of all space, time, matter, and energy."}]