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【ASTRONOMY天文學】：cosmos宇宙
　
1. satellite [ˋsætḷ͵aɪt] n. 衛星；人造衛星
A satellite is a natural object in space that moves around a planet or star.
A satellite is an object which has been sent into space in order to collect information or to be part of a communications system.
　
2. meteorite [ˋmitɪər͵aɪt] n. 隕石
If a meteoroid does not burn up completely, what's left strikes Earth’s surface and is called a meteorite.
　
3. meteoroid [ˋmitɪər͵ɔɪd] n. 流星體
Meteoroids are small bodies, often remnants of comets, traveling through space: A meteoroid is a piece of stony or metallic debris which travels in outer space.
When such a body enters the earth's atmosphere it is heated to luminosity and becomes a meteor.when such a body enters the earth's atmosphere it is heated to luminosity and becomes a meteor.
　
4. meteor [ˋmitɪɚ] n. 流星
A meteor is a piece of rock or metal that burns very brightly when it enters the earth's atmosphere from space.
● meteor shower 流星雨
　
5. comet [ˋkɑmɪt] n. 彗星
A comet is an icy body, when passing close to the Sun, heats up and begins to outgas, displaying a visible atmosphere or coma, and sometimes also a tail.A comet is a celestial body, observed only in that part of its orbit that is relatively close to the sun, having a head consisting of a solid nucleus surrounded by a nebulous coma, curved vapor tail arising from the coma when sufficiently close to the sun. Comets are thought to consist chiefly of ammonia, methane, carbon dioxide, and water.