Space because why not?

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Across
  1. 1. Fourth planet.
  2. 3. Used to be the ninth planet.
  3. 5. A system of millions or billions of stars.
  4. 7. The speed of what?
  5. 8. A cleaner you use to clean a carpet.
  6. 10. Big rock in the solar system.
  7. 11. Biggest planet in our solar system.
  8. 12. Second planet.
  9. 14. Seventh planet.
  10. 16. Has rings.
  11. 17. We live on it.
  12. 18. The opposite of light.
  13. 19. A large object made of dust and ice that orbits the sun.
  14. 21. First planet.
Down
  1. 2. Sends people to space.
  2. 3. What orbit the sun
  3. 4. Eighth planet.
  4. 6. Human made objects sent to space to collect information.
  5. 9. Also sends people to space.
  6. 13. What gives us light.
  7. 15. What the topic is.
  8. 16. Far away suns.
  9. 20. A meteoroid that enters Earth’s atmosphere.
  10. 21. Orbits the Earth