The Sun-Earth-Moon System

3. A huge collection of stars, gas, and dust.
8. The lighter part of a shadow.
11. Phases of the Moon where more of the Moon's near side is lit each night.
13. Small, rocky, icy objects that orbits the Sun.
14. An event where the Moon moves into Earth's shadow.
16. The path an object follows as it moves around another object.
17. When Earth's rotation axis is tilted directly toward or away from the Sun.
18. An object that orbits the Sun and shares orbital path with objects of similar size.
21. A meteoroid that strikes a planet or a moon.

1. The lit part of the Moon or planet that can be seen from Earth.
2. Phases of the Moon where less of the Moon's near side is lit each night.
4. Small, rocky object that orbits the Sun.
5. The central, darker part of a shadow where light is totally blocked.
6. The spin of an object around its axis.
7. A small rocky particle that moves through space.
9. When Earth's axis is tilted neither toward or away from the Sun.
10. A meteoroid that has entered Earth's atmosphere and produces a streak of light.
12. An event where the Moon's shadow appears on Earth's surface.
15. An attractive force that exists between all objects of mass.
19. The line on which an object rotates.
20. The orbit of one object around another object.