Galaxy Vocab

2. A spiral galaxy with a central bar-shaped structure, often driving gas into the center. The Milky Way is a barred spiral.
3. Invisible matter that constitutes most of a galaxy's mass and holds it together.
4. Immense groups of smaller galaxy clusters; they are among the largest structures in the universe
6. States that the further away a galaxy is, the faster it is moving away from us, suggesting the universe is expanding
9. A type of active galaxy with a compact center, intense emission lines, and strong brightness variations.
10. An active galaxy that emits huge amounts of radio waves.
11. A galaxy with a central nucleus that emits excessive energy, often far exceeding the light of its stars.
15. The process where a large galaxy consumes a smaller one via gravity, often forming elliptical galaxies.
16. Ellipsoidal or spherical shape, containing mostly old, red stars, with little gas/dust and minimal star formation.
17. Groupings of hundreds to thousands of galaxies held together by gravity.

1. The poor cluster (roughly 30+ galaxies) containing the Milky Way, Andromeda, and Triangulum.
5. Features a rotating flat disc with spiral arms, a dense central bulge, and active star formation (e.g., Andromeda).
7. An intermediate form between spiral and elliptical, possessing a disk and bulge but no spiral arms
8. Lacks a distinct structure, often resulting from gravitational disruption.
12. Large, densely packed system of galaxies.
13. are vast, gravitationally bound systems of stars, gas, dust, and dark matter categorized by shape into spirals, ellipticals, and irregulars.
14. Small, loose group of galaxies.