The Universe

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Across
  1. 4. A cloud of gas and dust that will become an irregular galaxy
  2. 5. A star and everything that orbits it.
  3. 10. Every object exerts a force on every other object
  4. 12. A natural satellite of a planet
  5. 13. Force of gravity acting on an object
Down
  1. 1. Orbits a star, round dur to gravity and clear orbit
  2. 2. The amount of matter in an object, does not depend on gravity
  3. 3. Hydrogen and helium ball with nuclear fusion emits light
  4. 6. Distance from Earth to Sun, used inside of our solar system
  5. 7. Stars, gas and dust held together by gravity
  6. 8. A planet but without a cleared orbit
  7. 9. Measurement of distance used outside of our solar system
  8. 11. A small,rocky body that orbits the Sun. Large belt between Mars and Jupiter.