Puzzle time - Gravity

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Across
  1. 5. Stays the same and is not affected by gravity
  2. 7. The law of universal graviation relates gravitational force, mass, and distance.
  3. 9. The force that acts opposite to gravity
  4. 10. A body that travels around another body in space
Down
  1. 1. When only gravity is the acting force
  2. 2. Like mass, but is affected by gravity
  3. 3. Made up of billions of stars
  4. 4. The space between to objects
  5. 6. A rate of change in velocity
  6. 8. Force of attraction between objects due to mass