Across
- 2. A collection of stars and their systems
- 5. small rocky objects that
- 6. A cloud of dust and gas in space illuminated by one or more stars
- 8. The gasses surrounding the surface of a planet
- 10. A body that orbits a star (like the sun)
- 11. A system where two stars rotate around each other
- 15. A group of stars that form a specific pattern
Down
- 1. A small and dim galaxy
- 3. A person who is trained to travel in a spacecraft
- 4. A cavity in the ground of a celestial body
- 7. The gaseous outer layer of the sun's atmosphere
- 8. The studies of celestial bodies
- 9. The path of a celestial body in its revolution about another
- 12. Naturally-formed body that orbits planets
- 13. A scientist who studies the universe
- 14. angular distance of two celestial bodies