star cross word

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Across
  1. 4. used to identify characters
  2. 5. brightness depends on
  3. 7. digram hertzburg -russle
  4. 8. warmest stars
  5. 9. made up of mostly hydrogen
Down
  1. 1. dwarf size of earth
  2. 2. coldest stars
  3. 3. what is luminosity
  4. 6. used to measure between stars