Life out there

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Across
  1. 1. Where everything is
  2. 3. Part of what we breathe
  3. 5. Gas around a planet
  4. 7. An instrument that lets us see far away.
  5. 8. Space debris that enters the atmosphere
  6. 10. The milky way _____
Down
  1. 2. A person who travels in outer space
  2. 4. Something that does not come from Earth
  3. 6. The vehicle used to travel in outer space
  4. 9. What Earth is