Across
- 3. all of the star systems, galaxies, gas and dust
- 5. matter that we can't see but know exists; does not emit electromagnetic radiation
- 7. hypothetical form of energy, may make up as much as 71% of the energy in the universe
- 9. a violent explosion that occurs when a star's core succumbs to gravity
- 12. ball of glowing gas at a very high temperature
- 13. a large red-colored star that is collapsing inward on itself
- 14. our galaxy
- 15. the study of the universe
Down
- 1. two stars orbiting each other
- 2. Gravitational collapse shrinks the star's core to a white glowing sphere
- 4. this is so dense that light cannot escape the gravity
- 6. the shift of the absorption bands towards the red end of the spectrum
- 8. biggest group of stars; may contain hundreds of thousands of stars
- 10. group of stars
- 11. galaxies that are not spiral or elliptical