Galaxies

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Across
  1. 4. - center of the galaxy
  2. 7. - consists of planets, moons, asteroids, comets, and other celestial bodies
  3. 9. - small solid particles
  4. 11. - galaxy shape that is typically smaller and dimmer than other shapes
  5. 14. - largest and most common galaxy shape
  6. 15. - occupies space between stars within galaxies
Down
  1. 1. - also known as Messier 31 or M31
  2. 2. - invisible substance that is the majority of galaxy's mass
  3. 3. - dense, spherical region in the center of spiral galaxy
  4. 5. - primary source of light within galaxies
  5. 6. - region that surround the disk
  6. 8. - galaxy shape with arms
  7. 10. - also known as M33
  8. 12. - cluster of galaxies that the Milky Way is part of
  9. 13. - flattened, rotating structure that surrounds the bulge