Space, the Final Frontier

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Across
  1. 1. a dwarf planet that is very far away
  2. 3. one of Pluto's moons
  3. 5. this is a ball of dust, ice and rock
  4. 8. a star that is about 4.5 billion years old
  5. 9. the name of one of Mars 2 moons
  6. 14. comet you might see this object in 2061
  7. 15. a large group of stars, dust and gas
  8. 16. holds a galaxy together & we float without it
  9. 17. mars is the planet that is half the size of this
  10. 19. way all the stars humans can see are here
  11. 20. a spacecraft that travels through space
  12. 21. giant the sun will turn into this
  13. 22. the Red Planet
  14. 24. one of Jupiter's moons
  15. 25. some moons are shaped like these
Down
  1. 2. comets usually have ____ tails
  2. 4. a person who travels beyond earth
  3. 6. an object in space that travels around a planet
  4. 7. the small bright body in the head of a comet
  5. 10. a robot that can take pictures and collect stuff
  6. 11. Mars is this to Earth
  7. 12. this is a minor planet
  8. 13. Pluto has the largest one of these
  9. 18. a vehicle designed to fly in outer space
  10. 22. and _____ are the 2 planets without any moons
  11. 23. this is an exploding ball of burning gas