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all that exists in the physical world, such as space, planets, galaxies, etc.
宇宙
the universe, particularly when it is thought of as a systematic whole
宇宙, cosmos
a large number of star systems bound together by gravitational force
星系
a branch of science that studies space, planets, etc.
天文学, 星空科学
a pale band of light seen in the sky at night that contains the solar system and billions of other stars
银河, 银河系
the sun and the group of planets orbiting around it, including the earth
太阳系, 太阳系
the earth's atmosphere and the space beyond it
航空航天, 大气层和太空
(physics) the universal force of attraction between any pair of objects with mass
重力
a scientist who studies or observes planets, stars, and other happenings in the universe
天文学家
a specific group of stars that form a pattern and have a name related to their shape
星座, 星群
related to the sun
太阳的, 日心的
relating to the moon
月亮的, 阴历的
the explosion that, according to most scientists, caused the existence of the universe
大爆炸, 大爆炸理论
a place in the space with such high gravity that pulls in everything, even light
黑洞, 黑孔
an object in space that is a mass of ice and dust and when it nears the sun it starts illuminating in the shape of a tail
彗星
related to the universe and the vast space outside the earth
宇宙的, 普遍的
a piece of rock coming from outer space that passes through the Earth's atmosphere, producing light
流星, 陨石
a piece of rock or metal from space that has hit the surface of the earth
陨石, 流星体
a period during which the sun or the moon is shadowed by a dark circle
日食, 月食
a creature that is believed to exist in other worlds or planets
外星人, 异形
an object sent into space to travel around the earth and send or receive information
卫星, 航天器
to move around a star, planet, or a large object in space
绕轨道运行, 环绕
the action of circular movement around a fixed point
旋转
someone who is trained to travel and work in space
宇航员, 航天员
a vehicle designed to travel in space
航天器, 宇宙飞船
an operation carried out in space
任务
to send an object, such as a satellite, missile, etc., into space
发射, 启动
the act of counting numbers backwards to zero before the launch of a missile or spacecraft
倒计时, 倒数
a mysterious object that some people claim to have seen flying around in the sky and assume that it is a spaceship from another world
不明飞行物
a long journey taken on a ship or spacecraft
航行, 旅程
a US government agency responsible for space travel and the study of space
美国国家航空航天局（NASA）负责美国的民用太空计划。
the distance that a beam of light travels in a year, equal to 9.46 trillion kilometers
光年, 光年
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