The Code to the Safe in the Spaceship

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Across
  1. 4. Made up of a star, eight planets, and countlesss other dwarf planets
  2. 5. Rocky worlds revolving around the sun
Down
  1. 1. Made up by seven stars, forms the shape of a spoon
  2. 2. The whole mass of air surrounding the earth
  3. 3. the plate like planet you see at night.
  4. 6. An object that has been intentionally placed into orbit