AST-503intermediate

Galactic Disk, Bulge & Halo: Physical Mechanisms

The Milky Way is not a uniform swarm of stars. Decomposing the Milky Way into components lets astronomers reconstruct galaxy assembly, chemical enrichment, spiral structure, disk heating, and dark-matter distribution.

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intermediate48 minFact checked

Galactic Disk, Bulge & Halo: Physical Mechanisms

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AST-502Galactic Disk, Bulge & Halo: Structures & Vocabulary→

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AST-504Galactic Disk, Bulge & Halo: Observation, Measurement & Evidence→

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The Milky Way is not a uniform swarm of stars.

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Different components reflect different formation histories.

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Star counts, distances, proper motions, spectroscopy, gas mapping, and globular-cluster orbits reveal distinct spatial and kinematic populations.

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