What are Stars and Galaxies?

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Across
  1. 2. Everything that exists - planets, stars, dust, and gases
  2. 3. Characteristic that is related to a star's temperature
  3. 6. A pinwheel-like galaxy
  4. 7. A galaxy with no particular shape
  5. 9. A group of stars, dust, and gases
Down
  1. 1. A person who studies the universe
  2. 4. A galaxy shaped like a flattened globe
  3. 5. The study of the objects in space and their properties
  4. 8. A ball of hot, glowing gases