Where are we in the universe?

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Across
  1. 3. A collection of planets around a sun (2)
  2. 5. A planet named after the Roman god of love
  3. 8. The name of Earth’s galaxy (2)
  4. 9. A body of ice which burns up when entering Earth’s atmosphere, also known as a shooting star
  5. 11. A rock found in space
  6. 15. The scientific term given to an object in space
  7. 18. A large hole in a planet, usually made by an asteroid or meteor
  8. 19. Tiny particles which make up everything in the universe
  9. 21. The star at the centre of the Milky Way galaxy
  10. 23. The largest moon of Jupiter
  11. 25. The centre of a planet
  12. 26. The force which stops us floating
  13. 27. A large rock found in space
  14. 29. A place which contains large telescopes
  15. 30. A satellite rock which orbits the Earth
  16. 31. The length across a circle
  17. 32. A planet named after a Roman god who also gives their name to Saturday
Down
  1. 1. The closest planet to Earth
  2. 2. A gas giant planet, named after the Roman god of the sea
  3. 4. The top layer of a planet
  4. 6. A robot used for exploring space (2)
  5. 7. How far away one object is from another
  6. 10. The closest planet to the sun
  7. 12. A vehicle used to travel into space
  8. 13. The USA space agency
  9. 14. A 180 degree cinema which projects the stars on to the ceiling and walls
  10. 16. A scientist who works an an observatory
  11. 17. A collection of galaxies, including all known matter
  12. 20. An instrument you can look through to see objects far away
  13. 22. A collection of stars and planets
  14. 24. A large ball of fiery gas
  15. 28. When an object in space goes around another object