The universe

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Across
  1. 3. finding sth. new
  2. 5. sth. you can fly to the moon with
  3. 7. our sun is a ...?
Down
  1. 1. a galaxy is just a little light in it
  2. 2. just few men had set a foot on its surface
  3. 4. someone how wanst to explor the univers
  4. 6. the milkiway is a ...?