Outer Space

3. the orbital motion of a spatial body in a direction that is opposite of what is normal in a given system
8. What Pluto is classified as
9. a meteor that hits the Earth's surface
11. occurs when the Earth passes through the path of comets
13. a small rocky or metallic body in space
14. a body of gas that was once thought to orbit the Sun during the formation of the solar system
18. planets that are mainly made up of hydrogen and helium

1. gaseous hydrogen that is a main constituent of giant planets
2. is a collection of small, icy bodies that orbit the sun farther away than Neptune
4. planets that are composed of solid, rocky surfaces; the inner planets
5. the oval shape of a planet's orbit
6. a small icy body that has a long tail of "gas"
7. the mean distance from the center of the Earth and Sun
10. a meteorite that enters the Earth's atmosphere
12. Jupiter's dark bands and that are sinking clouds
15. the measure of how non-circular a planet's orbit is
16. steep slopes found at the margin of a flat or gently sloping area
17. Jupiter's light bands that are rising clouds