Across
- 4. a collection of 8 planets and their moons
- 5. An object that orbits a planet and isn’t a star
- 6. The most abundant chemical element
- 8. Elements A substance that ant be broken down into other substances
- 10. A large rounded body that is in space
- 11. Our Earth
Down
- 1. a substance or matter that will expand
- 2. A chemical element with the atomic number 2
- 3. purposed the nebular theory
- 4. A star at the center of the solar system
- 7. a cloud of dust and gas in space
- 9. a conspiracy