Across
- 5. A spherical region that surrounds the solar system, that extends from just beyond Pluto's orbit and contains billions of comets.
- 7. The change in the illuminated area of one celestial body as seen from another celestial body.
- 11. A bowl-shaped depression that forms on the surface of an object when a falling body strikes the object's surface or when an explosion occurs.
- 13. A region of the solar system that is just beyond the orbit of Neptune and that contains small bodies made mostly of ice.
- 14. A small, rocky object that orbits the sun; most are located in a band between the orbits of Mars and Jupiter.
- 15. The passing of the moon between Earth and the sun; during this the shadow of the moon falls on Earth.
Down
- 1. A body that revolves around a planet and that has less mass than the planet does.
- 2. A large, dark area of basalt on the moon.
- 3. An event in which the shadow of one celestial body falls on another.
- 4. The passing of the moon through Earth's shadow at full moon.
- 6. A bright streak of light that results when a meteoroid burns up in Earth's atmosphere.
- 7. When a satellite is at its closest point from Earth in its orbit.
- 8. A natural or artificial body that revolves around a planet.
- 9. A relatively small, rocky body that travels through space.
- 10. Any one of the four largest satellites of Jupiter.
- 12. When a satellite is at its furthest point from Earth in its orbit.