Across
- 3. A model of the solar system in which all planets revolve around the sun.
- 4. a small natural body in space that revolves around a planet
- 7. the four planets closest to the sun and similar in structure to Earth
- 8. the darkest part of a shadow
- 9. small, rocky solar-system bodies, most are found orbiting the sun in a region between Mars and Jupiter
- 10. A model of the solar system in which all planets revolve around Earth
- 11. The region of the moon's shadow that surrounds the umbra and is less dark
- 14. the different shapes of the illuminated side of the moon as seen from Earth
- 15. a chunk of rock that moves through the solar system
Down
- 1. the low, flat plains of basalt on the moon formed by ancient lava flow
- 2. asteroid-sized bodies in the protoplanetary disk from which the planets formed by accretion
- 5. the regular rise and fall of water in the oceans
- 6. a round depression in the surface of a planet, asteroid, or comet caused by the impact of a meteoroid
- 9. The process of adding mass in the formation of the planets by collisions between planetesimals
- 12. The event that occurs when the shadow of one body in space falls on another
- 13. A disk made of many small particles of rock and ice in orbit around a planet