1.1 Galactic Structure (Side & Cross-Section Views)

Diagrams of the galaxy's side and cross-section profiles identify the halo, spiral arms, galactic core, and central black hole.

Side view of the galactic disk, labeling the halo (dark matter), the spiral arms (Population I stars), and the galactic core (Population II stars), with a scale of distance in light-years.

Cross-section view of the galaxy labeling Sagittarius A (massive black hole), the Great Barrier, and the Galactic Barrier, with a scale in light-years.

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