moon

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Across
  1. 2. An invisible force that pulls towards Earth
  2. 5. The amount of matter in something
  3. 8. The heaviness of an object; the force of gravity on mass = weight
  4. 9. Making a complete turn around another object
  5. 11. The layer of gas surrounding planet Earth that is held in place by gravity
Down
  1. 1. Bowl-shaped indents on the surface of a planet, moon, or asteroid that are caused by collision with another object
  2. 3. Making a complete spin on an axis
  3. 4. A natural satellite that orbits a planet, some planets have no moons, and others have over 60 moons
  4. 6. An imaginary line that Earth rotates around
  5. 7. The star at the center of the solar system that supplies heat and light to Earth; it's enormous gravity keeps the solar system in orbit
  6. 10. The third planet from the sun and the only planet in the solar system where life exists
  7. 12. The path one object takes as it revolves around another object in space