A Cross in Space

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Across
  1. 4. closest galaxy to milkyway
  2. 6. looking far
  3. 7. strong gravity
  4. 9. sun
  5. 14. solid planets
  6. 15. largest moon
  7. 17. metal from space
  8. 19. very dense
  9. 20. big planet
Down
  1. 1. first light
  2. 2. explosion
  3. 3. rocks
  4. 5. other life
  5. 8. hot planet
  6. 10. distance
  7. 11. flying to space
  8. 12. dead star
  9. 13. atom
  10. 16. person
  11. 18. ice