Gravity Crossword Puzzle

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Across
  1. 3. A giant dust cloud that created the Sun.
  2. 5. measure of a gravitational pull on an object.
  3. 7. Is measured by how much matter an object has
  4. 9. The planet we live on.
Down
  1. 1. The celestial object that orbits the Earth.
  2. 2. The Earth was formed, built by __ and gravity.
  3. 4. There are _____ planets in our solar system
  4. 6. The force that pulls objects toward each other
  5. 8. Our Solar system is held by the ___'s gravity.