Across
- 2. Earth's most common gas
- 4. "Helio" and "Solar" both mean relating to the _______
- 7. The third planet from the sun
- 9. Planets that have a rocky crust
- 10. To move in a circle like fashion around the sun
- 12. An astronomer who disagreed with the Geocentric Model of Earth
- 13. Our home galaxy
Down
- 1. An image created by stars in the night sky
- 3. Jupiter, Saturn, Neptune, Uranus are all...
- 5. Asteroids, comets, planets and moons are all considered...
- 6. An imaginary line around which an object spins
- 8. For a planet to spin on it's axis
- 11. This is located at the center of the galaxy