gravity crossword

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Across
  1. 2. how much matter is in something
  2. 7. scientist who studied why objects fall
  3. 8. that pulls objects towards each other
  4. 9. planet in our solar system
Down
  1. 1. is the planet we live on
  2. 3. objects in the solar system rotate around this
  3. 4. how much gravitational pull is on something
  4. 5. what rotates around the earth
  5. 6. closest planet to the sun