Across
- 4. when a big star dies from an explosion
- 6. The biggest type of black hole
- 8. What every galaxy and thing is in
- 12. The substance that doesn't react with light and takes up most of the space in a galaxy
- 14. The galaxy that will collide with the Milky Way in 4-5 billion years
- 16. Whatever is trapped inside of it can't get out, even light.
- 18. Word to describe small galaxies
- 19. How much light is emitted from a star/celestial body
- 20. The leading nonreligious theory of how the universe began
Down
- 1. A luminous body that is visible in the sky
- 2. A star that suddenly lights up and becomes a new star
- 3. The center of objects in space like the Sun and Earth
- 5. The force that holds galaxies together
- 7. The word to describe galaxies that have a circular shape and spin
- 9. A word that describes a galaxy that doesn't have much structure and has a smooth image
- 10. The galaxy that we reside in
- 11. Word to describe a galaxy that doesn't have much symmetry and has little, old stars
- 13. The field of science in which galaxies are involved in
- 15. When lots of galaxies are held together by gravity
- 17. Relating to the universe or cosmos