Super Space Stuff

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Across
  1. 2. A group of stars, planets, gas and dust held together by gravity.
  2. 5. The path one object takes around another.
  3. 6. The gaseous area surrounding a planet or other body.
  4. 10. The distance which a ray of light would travel in one year.
  5. 11. It used to be considered a planet.
Down
  1. 1. A region of space around a very small and extremely massive object within which the gravitational field is so strong that not even light can escape.
  2. 3. A small, frozen mass of dust and gas revolving around the sun.
  3. 4. Solar system objects that are bigger than small solar system bodies such as comets and asteroids but not quite planets.
  4. 7. A big glowing star that is the source of life on planet Earth.
  5. 8. The center of a planet.
  6. 9. The largest moon of Pluto.