Across
- 2. a large group of stars, gas, and dust bound together by gravity
- 8. space and all of the matter and energy in it
- 10. a systematic way to categorize galaxies
- 13. the theory that the universe began with a tremendous expansion 13-15 billion years ago
- 14. a galaxy that is has a rotating disc structure with spiral arms extending from a central bulge with mostly young stars
- 15. smaller, less luminous galaxies
- 16. a distance of measurement used beyond a galaxy
- 18. used to calculate the distance based off a star's brightness
Down
- 1. used to measure a spiral galaxy's rotational velocity and brightness to measure distances of redshift
- 3. study of the origin, structure, and evolution of the universe
- 4. an increase in the wavelength of light as an object moves away from an observer
- 5. the universe is filled with traces of this early radiation
- 6. a round galaxy with mostly old stars
- 7. extremely, bright distant objects that contain black holes
- 9. a galaxy with a ring like structure with a bright nucleus
- 11. the distance light can travel in one year
- 12. galaxies with a strong radio emission
- 17. a galaxy with no definite shape or structure with mostly young stars