Is gravity different?

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Across
  1. 3. the type of gas that plants sometimes take in
  2. 4. an invisible force that pulls any object down
  3. 5. an image that helps you understand information
  4. 8. the air that surrounds a planet
  5. 9. a push or pull
  6. 12. zone the area around a star that is not too hot or too cold
  7. 14. to add a number to itself a number of times
Down
  1. 1. a scientist who studies outer space
  2. 2. something that happens again and again
  3. 6. a rocky object in outer space
  4. 7. a place with conditions where living things survive
  5. 10. a planet orbits a star outside of our solar system
  6. 11. the amount of matter an object has
  7. 13. a tool used to make very distant objects look closer