Across
- 2. everything that we know exists
- 4. The arm our solar system is located on
- 6. This is located at the very center of our galaxy
- 8. The type of galaxy that we live in
- 11. Sounds like static, left over energy from the Big Bang
- 12. He discovered that the galaxies are moving away from each other and the universe is expanding
- 13. The number of planets in our solar system
Down
- 1. A collection of planets that move around a sun
- 3. The star that is located in the center of our solar system
- 5. the name of the galaxy Earth is located in
- 7. massive collections of stars, planets, moons, and asteroids
- 9. The most accepted idea for how the universe was formed
- 10. this existed before the Big Bang