The Moon, the Earth, the Sun

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Across
  1. 2. Earth's natural satellite
  2. 4. a big hole on the Moon's surface
  3. 5. the shape of the Moon's orbit
  4. 8. the biggest planet
  5. 9. A force that pulls things toward Earth
Down
  1. 1. the biggest gravity in solar system
  2. 2. the smallest planet
  3. 3. a Moon shape that looks like a thin curve
  4. 6. the shape of the Moon, Sun, Earth
  5. 7. the path of the Moon around the Earth