AST-664intermediate

The Big Bang Model: Observation, Measurement & Evidence

The Big Bang model describes an early universe that was hotter, denser, and more uniform than today and has expanded and cooled over cosmic time. The Big Bang framework connects particle physics, nucleosynthesis, recombination, structure formation, cosmic age, and the thermal history of the universe.

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intermediate48 minFact checked

The Big Bang Model: Observation, Measurement & Evidence

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AST-663The Big Bang Model: Physical Mechanisms→

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AST-665The Big Bang Model: Advanced Connections→

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The Big Bang model describes an early universe that was hotter, denser, and more uniform than today and has expanded and cooled over cosmic time.

supported

Running cosmic expansion backward implies increasing density and temperature.

supported

The CMB has an almost perfect thermal spectrum, observed helium and deuterium abundances agree with early-universe nuclear calculations, and galaxy redshifts demonstrate expansion.