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Sun-Moon-Earth
| Term | Definition |
|---|---|
| Gravity | A force of attraction between objects that is due to their masses. |
| Eclipse | The partial or total blocking of one object in space by another |
| Waning | Becoming less bright, intense, or strong |
| Weight | measure of the force of gravity of an object's mass |
| Gibbous | A moon phase that looks like more than a half circle from Earth |
| Galaxy | A collection of stars, dust, and gas bound together by gravity |
| Crescent | A moon phase that looks like less than a half circle from Earth |
| Scale | the direct comparison of one object to another |
| Waxing | Becoming more bright, intense, or strong |
| Umbra | The darker part of the moon's shadow on the Earth |
| Penumbra | The lighter part of the moon's shadow on the Earth |