Galaxy Crossword!

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Across
  1. 3. luminous fixed points in the sky
  2. 4. central concentration of stars in a spiral galaxy
  3. 6. proved there are other galaxies than the milky way
  4. 8. the shape ranges
Down
  1. 1. a component of a galaxy
  2. 2. has no fixed shape
  3. 5. composed of stars with gas and dust
  4. 7. the milky way in an example of this type of galaxy