AST-658intermediate

Expansion of the Universe & the Hubble–Lemaître Law: Physical Mechanisms

On large scales, distant galaxies participate in cosmic expansion: their recession rate increases approximately in proportion to distance in the nearby Hubble flow. Cosmic expansion is used to estimate distances, cosmic age, dark-energy behavior, and the evolution of large-scale structure.

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Expansion of the Universe & the Hubble–Lemaître Law: Physical Mechanisms

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AST-657Expansion of the Universe & the Hubble–Lemaître Law: Structures & Vocabulary→

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AST-659Expansion of the Universe & the Hubble–Lemaître Law: Observation, Measurement & Evidence→

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On large scales, distant galaxies participate in cosmic expansion: their recession rate increases approximately in proportion to distance in the nearby Hubble flow.

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As the cosmic scale factor increases, comoving separations between widely separated unbound galaxies grow.

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