someone who is trained to travel and work in space
宇航员, 航天员
宇航员在太空任务期间进行了关于微重力效应的实验。
the layer of gases surrounding a planet, held in place by gravity
大气, 气体层
a large structure used as a long-term base for people to stay in space and conduct research
空间站, 太空基地
空间站的太阳能电池板为其系统和实验提供电力。
natural light that comes from the sun
阳光, 日光
the light coming from the moon
月光, 月亮的光
月光在荒凉的道路上投下了诡异的阴影。
any of the rocky bodies orbiting the sun, ranging greatly in diameter, also found in large numbers between Jupiter and Mars
小行星, 岩石天体
小行星的大小从微小碎片到直径数百公里的大型天体不等。
a scientist who studies or observes planets, stars, and other happenings in the universe
天文学家
天文学家观察遥远的星系以研究它们数十亿年来的形成和演化。
a branch of science that studies space, planets, etc.
天文学, 星空科学
天文学帮助我们理解宇宙的起源和天体的形成。
a large number of star systems bound together by gravitational force
星系
银河系是包含我们太阳系的星系，它是一个带有中央凸起和旋转臂的螺旋星系。
to send an object, such as a satellite, missile, etc., into space
发射, 启动
to move around a star, planet, or a large object in space
绕轨道运行, 环绕
国际空间站在大约408公里的高度绕地球运行。
a propulsion device with its own fuel that produces thrust through reaction forces
火箭, 运载火箭
工程师在受控设施中测试了火箭。
a natural object that moves in orbit around a planet or another larger celestial body
天然卫星
the sun and the group of planets orbiting around it, including the earth
太阳系, 太阳系
科学家研究太阳系以了解行星的形成。
a vehicle designed to travel in space
航天器, 宇宙飞船
工程师们在将航天器送往外部行星执行任务之前，彻底测试了其系统。
to travel over a long distance by sea or in space
航行, 航海
作为一名年轻的宇航员，她梦想航行到遥远的行星。
the earth's atmosphere and the space beyond it
航空航天, 大气层和太空
航空航天工业在开发航空和太空旅行的先进技术方面发挥着至关重要的作用。
a specific group of stars that form a pattern and have a name related to their shape
星座, 星群
古代文明利用星座在海上导航。
the force by which objects with mass attract one another, especially the force that draws objects toward the Earth
重力
relating to the moon
月亮的, 阴历的
有些人认为月球周期会影响人类行为。
a piece of rock coming from outer space that passes through the Earth's atmosphere, producing light
流星, 陨石
流星，也被称为流星，经常在夜空中可见为明亮的光线。
a single complete circular movement around an axis or along an orbit
旋转, 转动
轮胎的旋转以每分钟转数进行测量。
the central point or line around which an object turns
轴, 旋转轴
风扇叶片围绕其轴平稳旋转。
having or seeming to have no or little weight, caused by the absence of gravity
失重的, 处于无重力状态
在抛物线机动期间的失重飞行感觉模拟了太空旅行的感觉。
an operation carried out in space
任务
the first stage of a multistage rocket that provides the initial thrust for liftoff
助推器, 助飞火箭
the act of counting numbers backwards to zero before the launch of a missile or spacecraft
倒计时, 倒数
an unmanned spacecraft sent into space to collect scientific information and transmit it back
探测器, 航天探测器
