Space Crossword

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Across
  1. 3. Makes up 99% of all the mass in the solar system
  2. 5. Planet that orbits a star other than our sun
  3. 7. One revolution around the sun
  4. 9. Closest planet to the sun
  5. 10. Known as the "North Star"
Down
  1. 1. A cloud of gas and dust in space
  2. 2. Planet most similar to earth
  3. 4. Celestial body made of hot gasses, mainly H and He
  4. 6. A small rocky body orbiting the sun
  5. 8. The most inner part of the sun