Astronomy

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Across
  1. 3. Collection of a million of stars
  2. 5. Red planet of our solar system
  3. 6. Number of planets in our solar system
  4. 7. Predominant gas in Sun
  5. 8. Densest planet of our solar system
  6. 9. Earth's twin planet
Down
  1. 1. Morning Star of our solar system
  2. 2. Largest planet of our solar system
  3. 4. Study of heavenly bodies
  4. 5. Earth's satellite