Across
- 4. A type of galaxy
- 7. Cloud of interstellar gases and dust
- 11. Between star clusters
- 12. Occurring between stars
Down
- 1. Unit of interstellar distance
- 2. Object in orbit around a planet
- 3. Branch of astronomy dealing with objects outside the Milky Way
- 5. Star cluster
- 6. Darkest of Uranus' largest moons
- 8. From the Latin meaning "dawn"
- 9. A region of spacetime where gravity is so strong that nothing can escape from it (2 words)
- 10. Empty space