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　　15 comet n. 彗星

　　Astronomers had accidentally caught a comet in the act of turning into an asteroid.

　　16 asteroid n. 小行星

　　Extraction of helium-3 from the surfaces of asteroids is not likely to compare with that from the Moon.

　　17 satellite n. 卫星, 人造卫星

　　One month later a second satellite was launched into a somewhat higher orbit, of between 234 and 244 miles.

　　18 meteor n. 流星

　　From time to time Earth suffers bombardment from meteors and comets, and meteoritic impact has been a major planet-shaper and climate-modeler.

　　19 meteorite n. 陨石

　　Some people believe that dinosaurs were destroyed because of the effects of a gigantic meteorite.

　　20 revolution n. 旋转, 转数

　　The planet rotates in the same direction as its revolution around the sun.

　　21 rotation n. 旋转, 转动

　　It takes 243 Earth days for Venus to complete one rotation.

　　22 radiation n. 放射, 发光, 辐射

　　Sensors detected a dangerous level of radiation.

　　23 constellation n. 星座, 星群

　　Scientists have discovered a new a star in the constellation of Orion.

　　24 cluster n. 串, 束, 群 v. 使成群, 聚集

　　Most galaxies are found in clusters rather than in isolation.

　　25 lunar a. 月球的, 有关月球的

　　The first lunar module is now on display at the Smithsonian Air and Space museum in Washington.

　　26 eclipse n. (日,月)蚀

　　No solar eclipses will be visible from the United States in 1996, and only two will be visible from Earth.

　　27 velocity n. 速度, 迅速, 速率

　　In addition, there is no difference in velocity between movements which are long and those which are short.

　　28 corona n. 日冕, 冠状物

　　Corona is a circle of coloured light that can sometimes be seen around the moon at night.

　　29 terrestrial a. 地球的, 陆地的, 地球上的

　　A statistical analysis based on this data suggests that well over half the stars are being orbited by rocky terrestrial material.

　　30 planetary a. 行星的

　　The book lists all predictable astronomical phenomena for the coming year, such as planetary, lunar, and eclipse data.

　　31 exploration n. 考察, 勘探, 探查

　　Further exploration and appraisal drilling will be necessary to confirm the commercial potential for this discovery.

　　32 hypothesis n. 假说, 假设, 前提, 猜测

　　Our hypothesis is that the dolphins ate contaminated fish, and this affected the dolphins’ immune system.

　　33 assume v. 假定, 假设

　　We cannot assume the suspects to be guilty simply because they have decided to remain silent.

　　34 collision n. 碰撞, 冲突

　　These airbags are designed to protect car drivers in head-on collisions.

　　35 supernova n. 超新星

　　Another theory suggests that a supernova explosion occurred, destroying the companion sun and scattering its material toward our Sun.

　　36 nova n. 新星

　　Apparently a nova is a close binary system, made up of a cool, normal star and a White Dwarf.

　　37 light year n. 光年

　　The Japanese company is light years ahead of its European competitors.

　　38 gravitation n. 万有引力

　　Newton worried about that when his theory of gravitation required apparently instantaneous interaction between two distant objects.

　　39 nebula n. 星云

　　According to present-day ideas, a star begins its career by condensing out of a cloud of dust and gas known as a nebula.

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