Across
- 2. space rocks smaller than asteroids
- 4. A star an all objects that orbit it
- 7. resistance of matter to change in its state of motion
- 8. small rocky body orbiting the Sun
- 10. large planet with low density made mostly of hydrogen and helium
- 12. shaped like an oval
Down
- 1. small body of ice, dust and rock with a tail and orbits the Sun
- 3. average distance from Earth to Sun
- 5. distance from the center of a circle or sphere to its outer edge
- 6. rock from space buring as it passes through the Atmosphere
- 9. one of four terrestrial planets closest to the Sun
- 11. large group of billions of stars