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science 3
| Term | Definition |
|---|---|
| satellite | a object that orbits a planet |
| planet | a object that orbits a star,large enough to have been rounded by its own gravity |
| meteor | a streak of light in the sky produced by the burning of a meteoroid in earths atmosphere |
| comet | a loose collection of dust and ice that orbits the sun, topically in a long narrow orbit |
| star | a ball of hot gas primarily hydrogen and helium that undergoes nuclear fusion |
| constellation | a pattern of a grouping of stars that people imagine to represent a figure or object |
| axis | a imaginary line that passes through a planets center and its north and south poles about which the planet rotates |
| rotation | the spinning movement 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 | either two days of the year on which the sun reaches its greatest distance north or south of the equator |
| equinox | either two days of the year which neither two hemispheres are 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 objects downhill |
| law of universal gravitation | the scientific law that states that every object in the universe attracts every other objects |
| mass | the amount of matter in an object |
| weight | a measure of 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 an 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 |
| phase | on of the different apparent shapes of the moon |
| eclipse | the partial or total blocking of one object in space by another |
| solar eclipse | the blocking of the 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 the 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 greatest differences between consecutive low and high tides |
| neap tide | the tide with the least differences between consecutive low and high tides |
| maria | dark flat areas on earths surface formed from huge ancient lava flows |
| crater | a large rounded pit caused by the impact of a meteoroid. a bowl shaped area that forms around a volcano's central opening |
| meteoroid | a chunk of rock or dust in space generally smaller than an astroid |
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