Astronomy Crossword

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Across
  1. 6. Graph of orbital velocity versus radius in the disk of a galaxy
  2. 7. Contains most of the galaxy's stars and nearly all of its gas and dust
  3. 9. Invisible matter in space that contains gravity
  4. 11. Galaxy with arms that curve and loop around
  5. 12. a cloud of gas collapsing gravitionally to become a galaxy
Down
  1. 1. Flattened Cloud of billions of stars
  2. 2. Galaxy with no certain shape
  3. 3. Huge Collection of stars, solar systems, gas, and dust all held together by gravity
  4. 4. Large space cloud of gas and dust
  5. 5. Halo and central bulge together
  6. 8. Galaxy that is usually round or ovular
  7. 10. Spherical cloud of stars and star clusters that contain almost no gas and no dust