- Galaxies have a variety of shapes, but three types dominate:
- Spiral
- Elliptical
- Irregular
- Many galaxies have a massive black hole at their center.
- All but the nearest galaxies are receding from us and show a redshift in their light.
- The farther a galaxy is from us, the faster it recedes (Hubble law).
- Galaxies occur in groups called galaxy clusters.
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