1.2 space

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Across
  1. 3. (n) the sun and all the planets around it
  2. 5. (v) extend; open out
  3. 6. (adj) impressive, unbelievable
  4. 7. (phr) a huge planet made up of a substance that burns easily
  5. 9. (n) liquid used to wash your hair without using water to clean it
  6. 10. (n) a planet’s layer of air/gases around it
  7. 12. (v) influence
  8. 13. (phr) without the help of a telescope
Down
  1. 1. (phr) center made up of rock
  2. 2. (n) people who work on a spacecraft / ship
  3. 4. (n) condition where the force of gravity is absent (weightlessness)
  4. 8. (n) area where stars and other planets are
  5. 11. (v) indicate