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Earth Sun and Moon
| Term | Definition |
|---|---|
| satellite | An object that orbits a planet |
| planet | An object that orbits a star, is large enough to have become rounded by its own gravity, and has cleared the area of its own orbit |
| meteor | A streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere |
| comet | A loose collection of dust and ice that orbits the sun typically in a long, narrow orbit |
| star | A ball of hot gas primarily hydrogen and helium that under goes nuclear fusion |
| constellation | a pattern or grouping of stars that people imagine to represent a figure or object |
| axis | An imaginary line that passes through a planet's center and its north and south poles, about which a planet rotates |
| rotation | The spinning of a planet on its axis |
| revolution | The movement of an object around another object |
| orbit | The path of an object as it revolves around another object in space |
| calendar | A system of organizing time that defines the beginning, length, and divisions of a year |
| solstice | Ether of the two days of the year on which the sun reaches its greatest distance north or south of the equator |
| equinox | Either of the two days of the year on which neither hemispheres is tilted toward or away from the sun |
| force | A push or pull exerted on an object |
| gravity | The attractive force between objects; the force that moves things down hill |
| law of universal gravitation | The scientific law that states that |
| mass | The amount of matter in an object |
| weight | A measure of the force of gravity on an object |
| inertia | The tendency of an object to resist a change in motion |
| Newtons first law of motion | The scientific law that states that an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction |
| phase | One of the different apparent shapes of the moon as seen from earth |
| eclipse | The patrial or total blocking of one object in space by another |
| solar eclipse | The blocking of sunlight to earth that occurs when the moon is directly between the sun and earth |
| umbra | the darkest part of a shadow |
| penumbra | the part of a shadow surrounding the darkest part |
| lunar eclipse | the blocking of sunlight to the moon that occurs when earth is directly between the sun and the moon |
| tide | the periodic rise and fall of the level of water in the ocean |
| spring tide | the tide with the greatest difference between consecutive low and high tides |
| neap tide | the tide with the least difference between consecutive low and high tides |
| maria | Dark flat areas on the moons surface formed from huge antient lava flows |
| crater | a large pit caused by the impact of a meteoroid |
| meteoroid | a chunk of rock or dust in space, generally smaller than an asteroid |
Created by:
mwienclaw002
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