| Question |
Answer |
| astronomy | The study of the moon, stars and other objects in space. |
| axis | An imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates. |
| rotation | The spinning motion of a planet about its axis. |
| revolution | The movement of a planet about its axis. |
| orbit | The path of an object as it revolves around another object in space. |
| latitude | A measurement of distance from the equator, expressed in degrees north or south. |
| solstice | The two days of the year on which the noon sun is directly overhead at either 23.5 degrees South or 23.5 degrees North. |
| equinox | The two days of the year on which neither hemisphere is tilted toward or away from the sun. |
| vernal equinox | The day of the year that marks the beginning of spring in the Northern Hemisphere. |
| autumnal equinox | The day of the year that marks the beginning of fall in the Northern Hemisphere. |
| phase | One of the different shapes of the moon as seen from Earth. |
| eclipse | The partial or total blocking of one object by another. |
| solar eclipse | The blocking of sunlight to Earth that occurs when the moon is between the sun and Earth. |
| lunar eclipse | The blocking of sunlight to the moon that occurs when Earth is directly between the sun and moon. |
| umbra | The darkest part of a shadow. |
| penumbra | The part of the shadow surrounding the darkest part. |
| tide | The rise and fall of the level of water in the ocean. |
| gravity | The attractive force between two objects; its magnitude depends on their masses and the distance between them. |
| spring tide | A tide with the greatest difference between low and high tides. |
| neap tide | A tide with the least difference between low and high tides. |
| satellite | Any object that revolves around another object in space. |
| geosynchronous orbit | The orbit of a satellite that revolves around Earth at the same rate that Earth rotates. |
| telescope | A device built to study distant objects by making them appear closer. |
| crater | A round pit on moon's surface. |
| maria | Dark, float regions on the moon's surface. |
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