Across
- 2. billions of stars held together by gravity
- 6. the theory that tries to explain how the universe began
- 11. a large spacecraft that constantly orbits Earth
- 12. our Sun is an example of this object
Down
- 1. a celestial body that orbits the sun eg Earth
- 3. an instrument used to observe celestial bodies
- 4. the name of our galaxy
- 5. a cloud of gas and dust in outer space
- 7. all exisiting matter and space
- 8. the natural satellite of a planet
- 9. a collection of planets that orbit the sun
- 10. a pulling force that keeps us on the ground