Space Crossword Puzzle

12345678910111213141516
Across
  1. 2. huge rotating collection of gas, dust, and billions of stars, planets, and other celestial objects
  2. 4. large, round celestial object that travels around a star, dominates its orbit, and has the shape of a sphere
  3. 6. celestial object that orbits the Sun and has a spherical shape but does not dominate its orbit
  4. 8. extremely dense quantity of matter in space from which no light or matter can escape
  5. 9. darkening of a celestial object due to the positioning of another celestial object
  6. 11. the scientific study of what is beyond Earth
  7. 12. everything that exists, including all energy, matter and space
  8. 13. all of the phases of the moon
  9. 14. producing and giving off light
  10. 15. massive collection of gases held together by its own gravity and emitting huge amounts of light energy
  11. 16. chunk of ice and dust that travels in a very long orbit around the Sun
Down
  1. 1. any object that exists in space
  2. 3. approximately 150 million kilometres
  3. 5. the brightness of stars in the night sky as they appear from Earth
  4. 7. the brightness of stars as if they were all located 33 ly away from Earth
  5. 10. closed path of a celestial object as it travels around another celestial object