Planet Crossword

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Across
  1. 1. a star that unexpectedly becomes very bright
  2. 4. an object similar to a planet that goes round another planet
  3. 5. ninth planet
  4. 8. rock that moves around in space
  5. 10. third planet
  6. 12. the group of planets and stars that the Earth belongs
  7. 14. sixth planet
  8. 16. a bright object in space that has a tail of gas
  9. 17. an extremely large group of stars and planets
  10. 18. forth planet
Down
  1. 2. second planet
  2. 3. fifth planet
  3. 6. eighth planet
  4. 7. first planet
  5. 8. a person who is trained to travel in a spacecraft
  6. 9. a very large hot ball of gas that appears as a small bright light in the sky at night
  7. 11. a very large round object that moves around the Sun or another star
  8. 13. any other planet
  9. 15. seventh planet