Solar System!

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Across
  1. 3. The path of an object that is moving around a second object or point
  2. 5. Turning of a body on its axis
  3. 7. The change in frequency of a wave (or other periodic event) for an observer moving relative to its source
  4. 11. Unit of distance, equal to the distance of the Earth from the Sun, about 150 million kilometers
  5. 12. The cutting off of light from one celestial body by another
  6. 14. A small body of ice and dust in orbit around the Sun
  7. 15. A large group of stars
Down
  1. 1. The luminous phenomenon seen when a meteoroid enters the atmosphere
  2. 2. An extremely distant, and thus old, celestial object whose power output is several thousand times that of our entire galaxy
  3. 4. All the matter and energy out there
  4. 6. A thin flow of energetic and gas charged particles that stream from the Sun
  5. 8. The distance light travels in a vacuum in one year
  6. 9. Movement of a planet around the Sun; more generally, orbital motion about a point
  7. 10. The shape an object takes in orbit
  8. 13. The sun's outer atmosphere