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Astronomy 8th
| Question | Answer |
|---|---|
| Rotation | Spinning of the Earth on its axis. |
| Axis | Imaginary line that passes through the Earth's center. |
| Umbra | Darkest part of the moon's shadow. |
| Penumbra | The larger part of the shadow. |
| Revolution | The movement of one object around another. |
| Lunar Eclipse | Occurs at full moon, when the Earth is directly between the moon and sun. |
| Orbit | The path the Earth follows as it revolves around the sun. |
| Total Lunar Eclipse | When the moon is in the Earth's umbra. |
| Calendar | A system of organizing time, that defines the beginning, length and divisions of a year. |
| Solstice | When the sun reaches its greatest distance north and south of the equator twice each year. |
| Partial Lunar Eclipse | Occurs when the moon passes partly into the umbra of the earth's shadow. |
| Equinox | Halfway between the solstice, when neither hemisphere is tilted toward or away from the sun. |
| Tide | the rise and fall of ocean water |
| force | a push or pull |
| spring tide | a tide with the greatest difference between consecutive high and low tides |
| gravity | the attractive force between objects |
| neap tide | a tide with the least difference between consecutive high and low tides. |
| newton's law of universal gravititaion | states that every oject in the universe attracts every other object |
| telescope | a device built to look at distant objects by making them appear closer |
| mass | amount of matter in an object |
| maria | the dark, flat surfaces of the moon |
| weight | force of gravity on an object |
| craters | large, round pits in the moon's surface |
| inertia | when an object resists a change in motion |
| highlands | mountains which cast dark shadows due to its peaks and the rim of the craters |
| newton's first law of motion | and object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by a force |
| phases | the different shapes of the moon seen from earth. |
| eclipse | when an object in space comes between the sun and a third object. it puts a shadow on that object. |
| rocket | a device that releases gas in one direction and moves in the opposite |
| apollo program | the american effort to land a man on the moon |
| thrust | the reaction force that propels a rocket forward |
| neil armstrong and buzz aldrin | both entered a tiny spacecraft called the eagle |
| velocity | speed in a given reaction |
| moonquakes | caused apollo astronauts to crash equipment on the moon's surface |
| orbital velocity | required of a rocket to start an orbit around the earth |
| space shuttle | a spacecraft that can carry a crew into space, return to earth and then be reused for the same purpose |
Created by:
lia ashley
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