Across
- 3. A massive galaxy cluster that contains hundreds or even thousands of galaxies.
- 6. A small galaxy cluster that contains only a few dozen galaxies.
- 7. A massive system of stars, gas, and dust held together by gravity.
- 10. A spiral galaxy that has a straight, bar-shaped band of stars running through its center.
- 11. Mysterious invisible stuff that doesn't give off light but makes up most of the matter in the universe.
- 14. A type of active galaxy that emits very strong radio waves from its core.
- 16. A lens-shaped galaxy that looks like a mix between a spiral and an elliptical but has no spiral arms.
- 17. A smooth, egg-shaped galaxy that contains mostly older stars and very little gas.
- 18. A galaxy with an extremely bright center that releases massive amounts of energy.
Down
- 1. The specific cluster of more than 50 galaxies that includes our own Milky Way.
- 2. A galaxy with no specific shape that usually looks like a messy blob of stars and gas.
- 4. The observation that galaxies are moving away from us at speeds proportional to their distance.
- 5. A flat, rotating galaxy with a central bulge and curved arms full of stars.
- 8. A giant collection of several galaxy clusters grouped together in space.
- 9. An active galaxy with a very bright, point-like nucleus that looks like a star.
- 12. A galaxy that stands out because it releases huge amounts of radio energy.
- 13. The process where a large galaxy uses gravity to collide with and "eat" a smaller one.
- 15. A lens-shaped galaxy that looks like a mix between a spiral and an elliptical but has no spiral arms.