Astronomy Crossword Puzzle

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Across
  1. 5. system The sun, planets, moons, asteroids and comets for instance
  2. 6. A cloud in outer space, mostly made of hydrogen and helium
  3. 8. Ours is made mostly of nitrogen and oxygen gas
  4. 9. Largest moon in the solar system
  5. 11. Earth's sister planet, too hot to live on
  6. 15. A belt of constellations starting with Aries and ending with Pisces
  7. 16. The seventh planet, it's tipped on its side
  8. 17. Dipper Seven stars that form the outline of a saucepan
  9. 19. The largest planet in our solar system
  10. 20. A large collection of billions of stars bound by gravity
  11. 21. Large and small rocks mainly found between Mars and Jupiter
  12. 22. A mix of ice and rock, it forms a long tail when it gets near the sun
  13. 23. Our nearest neighbor in space
  14. 26. hole A collapsed star with so much gravity its light can't get out
  15. 27. This spacecraft landed people on the moon
  16. 28. A rock from outer space that hits a planet like Earth
  17. 29. A space object that makes its own light by nuclear fusion
  18. 31. Innermost planet of our solar system
Down
  1. 1. Sixth planet from the sun, has beautiful rings
  2. 2. The "red planet"
  3. 3. An old red giant star in the constellation Orion
  4. 4. Third planet from the sun, it's filled with life
  5. 7. He figured out that planet orbits are elliptical not round
  6. 10. Far-out world discovered in 1930 by Clyde Tombaugh
  7. 12. This force keeps us from floating out into space
  8. 13. The eighth planet, 3 billion miles out
  9. 14. A room where the stars appear on a domed ceiling
  10. 18. He discovered moons orbiting Jupiter
  11. 22. An imaginary picture made out of connecting stars together
  12. 24. These are launched from Florida's Space Coast
  13. 25. A place from which to observe the sky and the universe
  14. 30. Someone who travels beyond the Earth's atmosphere