Across
- 2. a big chunk of metal and rock found in the universe
- 5. A theory that started the universe
- 7. when something is spinning
- 8. the force that keeps the sun and plants in orbit
- 10. the earth ____ around the sun
- 11. the thing we live in
- 13. something that enters the earth's atmosphere and burns up
- 14. made observations with the naked eye
- 15. is orbiting around another body
- 16. chunks of dust and ice that revolve around the sun
Down
- 1. a star system
- 3. the person who made the heliocentric model
- 4. when planets and moons revolve around the sun
- 6. when planets revolve around the earth
- 9. something we live in
- 12. chunks of rock and dust found from asteroids