✿ comet
[ˋkɑmɪt] n. 彗星
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 up to 2.4 million kilometers (1.5 million miles) in diameter and an elongated, 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.

✿ 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

✿ meteoroid
[ˋmitɪər͵ɔɪd] n. 流星體
Meteoroids are small bodies, often remnants of comets, traveling through space: when such a body enters the earth's atmosphere it is heated to luminosity and becomes a meteor.

✿ 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.

✿ spacecraft
[ˋspes͵kræft] n. 太空船;航天器 spaceship)
The spacecraft would rotate slowly about its long axis to pro-vide artificial gravity for the crew.
space capsule 太空艙;太空船
spacesuit 太空衣
space shuttle 太空梭
space telescope 太空望遠鏡
space debris 太空碎片;太空垃圾


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