Galaxy

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