planets

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Across
  1. 2. earths only satellite
  2. 5. the lightest gas
  3. 7. orbit
  4. 9. 78% of earth's atmosphere
  5. 10. huge collection of stars and planets
Down
  1. 1. star at the center of our solar system
  2. 3. 20% earths air
  3. 4. any planet outside of our solar system
  4. 6. force that keeps us on the ground
  5. 8. plasma held together by gravity