What's Out There?

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Across
  1. 2. Our galaxy type
  2. 5. The Hunter
  3. 6. Moon of Jupiter on which life might exist
  4. 8. Giant ball of hot gas
  5. 10. Next nearest spiral galaxy
  6. 12. Red Giant in Orion
  7. 13. Type of telescope with two lenses
  8. 16. North star
  9. 19. Our galaxy is called the Milky ......
  10. 20. Giant stars which collapse to zero size are called Black ......
  11. 21. Rocks which burn when entering the atmosphere
Down
  1. 1. Everything that exists
  2. 2. Type of black hole at the centre of the Galaxy
  3. 3. planet's natural satellite
  4. 4. group of stars in a pattern
  5. 7. Worked out that the planets orbit the Sun
  6. 9. Collection of billions of stars
  7. 11. Left over meteor on the surface
  8. 14. Giant rocks which orbit the Sun
  9. 15. No longer a planet
  10. 16. common name for Ursa Major
  11. 17. emptiness
  12. 18. Made of frozen gases, ice, dust and small rocks
  13. 22. To travel around