Solar system and space

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Across
  1. 3. All of space and all the matter in it
  2. 4. The natural satellite of the Earth
  3. 7. A big gassy,light blue planet that spins on its side
  4. 8. Imaginary line on which the earth rotates or spins
  5. 10. The hottest planet in the solar system
  6. 12. The smallest planet in the Solar System
  7. 15. Causes day and night
  8. 16. How long it takes the earth to complete a revolution
  9. 18. System The sun and planets with their moons in orbit around the sun
  10. 19. An object made of ice and dust that forms a tail when near the sun
Down
  1. 1. A giant planet with large rings made of dust and gas
  2. 2. A person who is trained to travel in a spacecraft
  3. 5. A system of billions of stars, planets and gas
  4. 6. The biggest planet in the solar system
  5. 9. A tool used to view far away objects in space
  6. 11. The star that the Earth and other planets orbit
  7. 13. Movement of the earth around the sun
  8. 14. Huge balls of burning gases
  9. 17. A planet that has 70% of its surface covered with liquid water
  10. 20. A red planet with volcanoes and very high mountains