Space crossword

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