Across
- 2. Red Planet
- 3. Planets Many moons,having ring systems,and being composed primarily of hydrogen,helium
- 7. Bang Theory Beginning of the Universe
- 10. Objects Natural occurring physical structure in the universe
- 11. system Created 4.6 billion years ago
Down
- 1. Planets Solid,hard surfaces,dense metallic cores,and few or no moons.
- 4. Theory Collapse,Flattening,Fusion and Accretion
- 5. Planets round celestial bodies orbiting the Sun that have not cleared their orbital path
- 6. Giants Massive planets composed mainly of hydrogen, helium, and other gases
- 8. Natural force that pulls any two objects with mass toward each other
- 9. Created 13.7 billion years ago