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