Across
- 2. a fundamental system in condensed matter sciences and the main constituent of gas giant planets
- 4. meteoroid becomes this after it survives a trip through the earths atmosphere and hits the ground
- 7. the mean distance between the center of the Earth and the center of the sun
- 12. the light spots on the moon
- 13. a flattened out circle or oval it is a circle
- 14. planet smaller than the average planet in the solar system
- 15. a number of meteors that fall from the sky
- 16. an accretion of dust and ice particles in a rock-like formation
- 18. a doughnut-shaped region of icy objects beyond the orbit of Neptune
Down
- 1. planets made up of rocks or metals with a hard surface
- 3. the measure of how circular a planet is
- 5. a steep slope or cliff formed by folded or eroded layers of rock
- 6. ball of ice and dust that orbits the sun
- 8. the orbital motion of a spatial body in a direction that is opposite of what is normal in a given system
- 9. lumps of rock or iron that orbit the sun
- 10. the dark spots on the moon / maria
- 11. planets made entirely out of gas and other materials
- 17. becomes a "shooting star" when it enters the earths atmosphere