Space

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Across
  1. 3. used to look into space
  2. 7. spiders, monsters and snakes are this
  3. 8. the earth has one of these, it is seen at night
  4. 9. used to broadcast TV across the world
  5. 12. very difficult to do
Down
  1. 1. mars, venus and neptune are all one of these
  2. 2. someone who goes into space
  3. 4. lots of these light up the night sky
  4. 5. a word meaning "clever"
  5. 6. this is bright and shoots through the sky at night
  6. 10. they come in peace
  7. 11. aliens come to earth in this