AST-728intermediate

Galaxy Rotation Curves: Physical Mechanisms

Galaxy rotation curves measure orbital speed as a function of distance from galactic centers. Rotation curves constrain dark-halo profiles, test galaxy-formation models, and serve as a primary arena for comparing dark-matter and modified-gravity hypotheses.

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Galaxy Rotation Curves: Physical Mechanisms

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AST-727Galaxy Rotation Curves: Structures & Vocabulary→

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AST-729Galaxy Rotation Curves: Observation, Measurement & Evidence→

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Galaxy rotation curves measure orbital speed as a function of distance from galactic centers.

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For circular motion, orbital speed depends on enclosed gravitating mass.

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Rotation curves across many galaxy types repeatedly show mass discrepancies, supplemented by lensing, satellite dynamics, cluster evidence, CMB results, and structure formation.