Across
- 1. A scientific ______ is one that is supported by a great amount of evidence and support, but can be disproven by new evidence
- 5. A ______ _____ cannot be seen because they emit no light, but they are found in most galaxies (2 words)
- 10. Our galaxy is this type (2 words)
- 11. The coldest stars live _____ than the hottest stars (longer or shorter)
- 13. All matter & energy was once contained in a very small dense _____.
- 14. The name of our galaxy (2 words)
- 16. By working backwards from the known current expansion rate of the universe, scientists have determined that the universe is 13.8 ____ years old
- 18. The universe is everything and is ______________
- 19. This force helps hold galaxies together
Down
- 2. The scientist who determined that galaxies were moving away & that the farthest ones were moving the fastest
- 3. The color of the dimmest stars
- 4. The brightest stars live ______ that the dimmest starts (longer or shorter)
- 6. The type of galaxy that is made of mostly old stars
- 7. The process of two hydrogen atoms fusing together to create helium and a lot of energy (2 words)
- 8. The type of galaxy that is made of mostly bright young stars
- 9. Cosmic background ________ is wave energy that is left over after the universe first cooled and is detectable every where in our universe
- 10. The rapid expansion event that created the universe (2 words)
- 12. A large group of stars and dust that is held together by gravity is called a _______
- 15. The color of the hottest stars
- 17. An increase in the wavelength of light emitted from galaxies as they move away from us (2 words)