space puzzle

2. An irregularly shaped cluster that contains fewer than 1000 galaxies, many spiral, and no giant ellipticals.
6. spiral like
8. theory that larger galaxies eat smaller galaxies.
9. A bright blue galaxy in which many new stars are forming, thought to be caused by collisions between galaxies.
11. The cluster of about 40 nearby galaxies of which our Milky Way Galaxy is a member.
13. A galaxy that emits radio energy from two regions (lobes) located on opposite sides of the galaxy.
14. A long strand of gas, dust, and stars drawn out of a galaxy interacting gravitationally with another galaxy.
15. An otherwise normal spiral -galaxy with an unusually bright, small core that fluctuates in brightness; thought to indicate the core is erupting.

1. The theory that double radio lobes are produced by pairs of jets emitted in opposite directions from the centers of active galaxies.
3. In radio astronomy, a bright spot in a radio lobe.
4. A cluster containing more than 1000 galaxies, mostly elliptical, scattered over a volume about 3 in diameter.
5. The central energy source of an active galaxy.
7. A galaxy that resembles a ring around a bright nucleus; thought to be the result of a head-on collision of two galaxies.
10. A galaxy that is a source of excess radiation, usually radio waves, X-rays, gamma-rays, or some combination.
12. A galaxy that is a strong source of radio signals.