Across
- 4. Tiny, hot, dense point
- 7. The Milky Way is a ___________ galaxy.
- 8. Geo means
- 9. Centric means
- 10. There are ________ galaxies.
- 11. We live on the __________
- 12. The _____ is entirety of space, time, matter, and energy.
Down
- 1. Helio means
- 2. exploded and began expanding forming stars, galaxies, etc.
- 3. The Big Bang happened 13.8
- 4. The _______ system is a celestial bodies orbiting the a star.
- 5. ______massive systems of stars, stars clusters, and other matter
- 6. matter is held together by_____________
- 7. no beginning or ending
- 9. wave background disapproved the Steady State