SPACE !!!

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Across
  1. 1. Earth is a ...
  2. 5. The opposite of the sun.
  3. 6. A planet with a ring.
  4. 7. They live in other planets.
Down
  1. 2. He/She explores space.
  2. 3. A "car" that takes you to space.
  3. 4. It has 8 planets.