Chapter 32

4. A region between the orbits of Mars and Jupiter containing small, rocky, planetlike figures that orbit the Sun.
6. The plane of Earth's orbit around the Sun.
7. The phenomenon whereby the shadow of Earth falls upon the Moon, producing the relative darkness of the full Moon.
9. The idea that the Sun and planets formed together from a cloud of gas and dust.
10. The cycles of change of the "face" of the Moon, changing from new, to waxing, to full, to waning, and back to new.
12. A small rock in interplanetary space, which can include a fragment of an asteroid or comet.
13. A body composed of ice and dust that orbits the Sun.
15. The four planets orbiting beyond 2 AU of the Sun.
17. The phase of the Moon when darkness covers the side facing the Earth.
18. The phase of the Moon when its sunlight side faces the Earth.

1. A meteoroid that has survived passage through Earth's atmosphere to reach the ground.
2. The major bodies orbiting the Sun that are massive enough for their gravity to make them spherical and small enough to avoid having nuclear fusion in their cores.]
3. The average distance between Earth and the Sun.
5. The disk-shaped region of the sky beyond Neptune populated by many icy bodies and a source of short-period .
8. The phenomenon whereby the shadow of the moon falls upon Earth, producing a period of darkness in the daytime.
10. The streak of light produced by a meteoroid burning in Earth's atmosphere.
11. A relatively large icy body, such of Pluto, originating within the Kuiper belt.
14. The four planets orbiting within 2 AU of the Sun.
15. The region beyond the Kuiper belt populated by trillions of icy bodies and a source of long-period comets.
16. Temporary, relatively cool and dark regions on the Sun's surface.