Across
- 2. A natural satellite of a planet
- 4. All existing matter and space
- 6. Relating to a star or stars
- 8. A contracting mass of gas in the formation of a star
- 12. A celestial body moving in orbit around a star
- 13. found on the periodic table
Down
- 1. Relating to the cosmos
- 3. A proton or neutron
- 5. A large, remote incandescent body
- 7. A system of millions or billions of stars
- 9. A cloud of gas and dust in outer space
- 10. The positively charged central core of an atom
- 11. The curved path of a celestial object around a star, planet, or moon