solar system crossword

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Across
  1. 1. the second smallest planet in our solar system
  2. 4. these planets haven’t ¨Cleared their neighborhood¨
  3. 6. coldest planet in the solar system
  4. 8. an animal that was sent into space on 9 March 1961
  5. 9. a program to see if humans could function in space.
  6. 12. Jupiter’s volcanic moon
  7. 15. about the size of a pebble
  8. 16. has 27 moons
  9. 17. Jupiter's moon that is very close to Earth's moon
  10. 20. last person to walk on the moon
  11. 22. named after the roman god of Thieves
  12. 23. the only planet with life
  13. 24. larger than meteoroids
  14. 25. It is the only moon in the entire solar system with a dense atmosphere
Down
  1. 1. a minor space object that has entered the Earth's atmosphere
  2. 2. has over 30 rings
  3. 3. first astronaut in space
  4. 5. first animal/dog in space
  5. 7. neptune’s largest moon
  6. 10. NASA's second human spaceflight program
  7. 11. Earth’s sister planet
  8. 13. the first mission to land a man on the moon
  9. 14. has the big red spot
  10. 15. when they hit the surface of a planet or a moon it is considered a
  11. 18. the second person to walk on the Moon
  12. 19. became the first American woman in space aboard the space shuttle
  13. 21. a monkey who successfully was sent to space