Galaxy

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Across
  1. 2. the star at the center of the Solar System
  2. 5. the third planet from the Sun
  3. 6. the sixth planet from the Sun and the second largest planet in the Solar System
  4. 8. the smallest and closest to the Sun
  5. 11. the fifth planet from the Sun and the largest planet in the Solar System
  6. 14. a hot star with a luminosity class of III
  7. 15. an astronomical object orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity
  8. 16. the galaxy that contains our Solar System
  9. 17. known as a shooting star
  10. 18. the eighth and farthest planet from the Sun in the Solar System
  11. 20. the second planet from the Sun
Down
  1. 1. Dwarf a stellar remnant composed mostly of electron-degenerate matter
  2. 3. the seventh planet from the Sun
  3. 4. the fourth planet from the Sun
  4. 7. the gravitationally curved path of an object around a point in space
  5. 9. a luminous giant star of low or intermediate mass
  6. 10. a sudden, complete or marked change in something
  7. 12. circular movement of an object around a center (or point) of rotation
  8. 13. a massive, gravitationally bound system consisting of stars, stellar remnants, an interstellar medium of gas and dust
  9. 19. the second-most-massive known dwarf planet in the Solar System