Space

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Across
  1. 6. The force that keeps us on earth.
  2. 7. When you hide certain information
  3. 8. A synonym for 'alien'.
Down
  1. 1. The area beyond the earth's atmosphere where aliens live.
  2. 2. Information that has to remain secret is ...
  3. 3. A period of 1,000 years.
  4. 4. An event that can't be explained.
  5. 5. Enter something to occupy it e.g. Aliens may ... earth one day.