Across
- 4. An important telescope in orbit of earth
- 6. The largest planet in our solar system
- 7. The distance that a beam of light can travel through space for 1 year
- 8. A region of rocky debris that forms a ring all the way around the Sun
- 10. A certain type of galaxy with a bar across them
- 12. A concentration of stars in a small region of space
- 15. The galaxy that we live in
- 17. The average distance between the Sun and Earth
- 18. Center of our solar system
- 19. A large cloud of dust and gas
- 21. A star exploding
Down
- 1. A galaxy without a regular shape
- 2. a galaxy shaped like a flattened sphere
- 3. Hot ball of gas
- 5. The process in which nuclei fuse together and form larger atoms
- 9. 300 000 km/s
- 11. Matter that is invisible
- 13. A group of three stars that orbit each other
- 14. The formation of the universe
- 16. A part of the electromagnetic spectrum that we can see
- 20. A region of space where gravity is so strong that nothing can escape