Aster/stell

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Across
  1. 2. like a star
  2. 3. a group of stars
  3. 5. a small planet
  4. 6. science which studies stars and their movements
Down
  1. 1. a calamity
  2. 4. extremely large
  3. 5. a star used in printing to refer to a margin note
  4. 6. a fall flower shaped like a star