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Top 7: E/S/M Sys
Topic 7: Earth-Sun-Mood System
| Term | Definition |
|---|---|
| satellite | an object that orbits a planet; any object that orbits around another object in space |
| star | a ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion |
| 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 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 ice and dust that orbits the sun, typically in a long, narrow orbit |
| constellation | a pattern or grouping of stars that suggest the outline of a figure or object |
| geocentric | a model of the universe in which Earth is at the center of the revolving planets and stars |
| heliocentric | a model of the solar system in which Earth and the other planets revolve around the sun |
| ellipse | an oval shape, which may be elongated or nearly circular; the shape of the planets' orbits. |
| axis | an imaginary line that passes through a planet's center and its north and south poles, about which the planet rotates |
| rotation | the spinning motion 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 |
| solstice | either of the two days of the year on which the sun reaches its greatest distance from the equator |
| equinox | either of the two days of the year on which neither hemisphere is tilted toward or away from the sun |
| gravity | the attractive force between objects; the force that moves objects downhill |
| law of universal gravitation | states that every object in the universe attracts every other object |
| phase | one of the different shapes of the moon as seen from Earth |
| eclipse | the partial or total blocking of one object in space by another |
| umbra | the darkest part of a shadow |
| penumbra | the part of a shadow surrounding the darkest part |
| 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 |
Created by:
muellershauna
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