| A | B |
|---|
| orbit | to move in a path around another heavenly body |
| rotate | to turn on an axis |
| revolve | to move in an orbit |
| moon | a heavenly body that revolves around a planet; Earth has one of these. |
| crater | a big hole found on the surface of planets or moons; they are usually caused by asteroids |
| phase | the shape or appearance of the moon or a planet at a certain time in its cycle of changes |
| satellite | a heavenly body that travels in an orbit around a larger heavenly body |
| eclipse | the partial or complete blocking of light ffrom one heavenly body by another |
| gravity | the natural force that causes smaller objects toward the center of the earth |
| telescope | a device that uses an arrangement of lenses or mirrors in a long tube to make distant objects appear closer |
| atmosphere | the gas that surrounds a body in space, especially the air that surrounds the earth |
