In Space

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Across
  1. 4. the layer of gases around a planet
  2. 7. a vehicle to travel to space
  3. 8. someone who studies objects in space
  4. 9. a bright glowing object in space
Down
  1. 1. one million million
  2. 2. a huge system of stars, gas, dust...
  3. 3. an optical instrument used to observe distant objects in space
  4. 5. an object in space that orbits around a star
  5. 6. the outer or top layer