Earth and space science

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Across
  1. 3. The layer of our atmosphere that protects us from UV rays
  2. 4. What planets orbit around
  3. 5. One _ of a planet is its day
  4. 6. Earth's is 23 degrees
  5. 7. One _ is a planet's year
Down
  1. 1. The _ contains 8 planets and a star
  2. 2. The force of attraction
  3. 4. Our star
  4. 8. Our planet