Big Bang and Galaxies

4. some galaxies (like Leo and Andromeda) are named after the _____ they are found in
5. this type of spiral galaxy has a bar of stars forming the center bulge of the galaxy
7. the end of the universe where it accelerates its expansion until the galaxies are pulled apart faster than the speed of light
9. the doppler effect in light waves that indicates that an object is moving away from us
10. Irregular galaxies form when 2+ galaxies ___ with each other.
14. the type of galaxy that is a flat disk, but no spiral arms
16. the universe continues to expand until everything is spread out and it runs out of energy
18. astronomer who set up a system to classify galaxies
20. the main element formed in the big bang and the most abundant element in the universe
22. the type of galaxy with a disc shape and curved "arms" spreading out from the center (~pinwheel)
24. the name of the galaxy that our solar system is part of
25. the force that causes the accelerated expansion of the universe; makes up 73% of the universe

1. leftover thermal energy and radiation from the big bang
2. the force that holds the universe together; makes up 23% of the universe
3. the type of galaxy with a round or football shape
6. the end of the universe where it stops expanding and stars contracting
8. the type of galaxy with an odd or unusual shape
11. theory that the universe began as a single point that expanded rapidly about 14 billion years ago
12. the______ is about 14 billion years old
13. how do we perceive the radiation from the beginning of the universe
15. single galaxies have ___ (#) of stars
17. The bulge of the many spiral galaxies contains a supermassive___.
19. an unbelievably huge clump of stars / solar systems
21. a huge cloud of gas & dust
23. the bright, round, inner part of a spiral galaxy - where lots of stars are crowded together