Gravity crossword

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Across
  1. 2. Galilei: the scientist who tested gravity
  2. 4. Dust and Gravity: what the earth is made of
  3. 5. one factor that acts on gravity
  4. 9. what the planets orbit because of gravity
  5. 10. the force that governs the solar system
Down
  1. 1. the amount of matter in an object
  2. 3. the scientist who discovered gravity
  3. 6. law that statsobjects in motion will stay in motion in a line
  4. 7. the dust + gas that made our solar system
  5. 8. the amount of gravity exerted on an object