The Universe

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Across
  1. 2. a giant gas ball
  2. 5. the unit to measure distance in space
  3. 6. a light colorless gas
  4. 8. the gas that gives sky its blue color
Down
  1. 1. it carries people and goods to ISS
  2. 3. the study of universe
  3. 4. the name of our galaxy
  4. 7. a group of stars and planets