Across
- 4. A unit of distance equal to 1000 pc
- 5. The theory that large galaxies absorb smaller galaxies.
- 8. A bright blue galaxy in which many new stars are forming
- 10. The spherical region of a spiral galaxy containing a thin scattering of stars
- 13. Nonluminous material that is detected only by its gravitational influence
- 14. Star poor in atoms heavier than helium
Down
- 1. An irregularly shaped cluster that contains fewer than 1000 galaxies
- 2. Star rich in atoms heavier than helium
- 3. A long strand of gas, dust, and stars drawn out of a galaxy
- 6. A cluster containing more than 1000 galaxies
- 7. Object used to map the spiral arms
- 9. The cluster of about 40 nearby galaxies
- 11. Long, spiral pattern of bright stars, star clusters, gas
- 12. In astronomical usage, any atom heavier than helium.
- 13. component All material confined to the plane of the galaxy.