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13 The Milky Wayn. 银河系
One reason to think that the Milky Way had such a meal several billion years ago is its structure.
14 The Big Bang n. 宇宙大爆炸
The Big Bang theory is the belief that the universe originated as the result of a large explosion of a single mass of matter.
15cometn. 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.
17satelliten.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 meteorn.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 meteoriten.陨石
Some people believe that dinosaurs were destroyed because of the effects of a gigantic meteorite.
20 revolutionn. 旋转, 转数
The planet rotates in the same direction as its revolution around the sun.
21 rotationn. 旋转, 转动
It takes 243 Earth days for Venus to complete one rotation.
22 radiationn. 放射, 发光, 辐射
Sensors detected a dangerous level of radiation.
23 constellationn. 星座, 星群
Scientists have discovered a new a star in the constellation of Orion.
24 clustern. 串, 束, 群 v. 使成群, 聚集
Most galaxies are found in clusters rather than in isolation.
25 lunara. 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.