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
彗星是由冰、尘埃和岩石物质组成的天体。
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。
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 glowing cloud of gas and dust in outer space, often the result of a star explosion or formation
星云, 气体和尘埃云
星云在恒星爆炸或脱落外层时形成。
a natural light display in the Earth's polar regions, caused by the collision of charged particles from the sun with atoms in the Earth's atmosphere
极光, 北极光
摄影师前往偏远地区，以惊人的图像捕捉极光的迷人美丽。
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。
(astronomy) the celestial zone in the sky where the sun, moon, and planets appear to move, traditionally divided into twelve equal segments, each associated with a distinct name and symbol
黄道带, 十二宫带
仔细观察黄道带内恒星的位置是早期天文学家发展占星思想的关键。
a planet that is outside the solar system
系外行星, 太阳系外行星
寻找宜居的系外行星是寻找外星生命的关键焦点。
the displacement of the spectrum of an astronomical object toward shorter wavelengths, indicating motion toward the observer
蓝移, 蓝位移
a small, dense, and faint stellar remnant that is left after a medium-sized star exhausts the nuclear fuel in its core and undergoes gravitational collapse
白矮星, 白矮星恒星
恒星的引力坍缩使其成为一颗紧凑且地球大小的白矮星。
a highly dense and compact stellar remnant that remains after a massive star undergoes a supernova explosion, consisting almost entirely of neutrons
中子星, 中子恒星
中子星的极端密度使得一块方糖大小的中子星物质在地球上重达数百万吨。
the scientific study of how the universe is created, its development, and how it is going to end
宇宙学, 宇宙研究
a type of galaxy characterized by a spiral-shaped structure, consisting of a central bulge surrounded by spiral arms that contain stars, gas, and dust
螺旋星系, 旋涡星系
M51，也被称为涡旋星系，是位于猎犬座的一个令人惊叹的螺旋星系。
a type of galaxy characterized by its smooth, nearly featureless brightness profile and ellipsoidal shape, lacking significant spiral arms or disk-like structures
椭圆星系, 椭圆型星系
an optical instrument used for analyzing the spectrum of light, separating it into its individual wavelengths to identify and study the components of the light source
分光镜, 光谱分析仪器
化学家在实验室中使用分光镜，根据其光谱线中的独特模式来识别样品中的元素。
a galaxy that lacks a distinct, regular shape or structure, often appearing chaotic and asymmetrical
不规则星系, 无明确形状的星系
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
军方调查了军事基地附近多起不明飞行物的报告。
an unmanned spacecraft designed to explore outer space, gather scientific data, and transmit it back to Earth
空间探测器, 星际探测器
帕克太阳探测器是一艘太空探测器，任务是研究太阳的外日冕并了解太阳风的动力学。
an astronaut from Russia or the former Soviet Union
宇航员
国际空间站上的宇航员在微重力环境下进行科学实验。
a layer of charged particles, primarily electrons and protons, held in place around a celestial body by its magnetic field
辐射带, 放射带
the shift of light waves towards longer wavelengths, indicating the motion of an object away from the observer, commonly observed in the spectra of distant celestial bodies
红移, 紅移
观测到恒星光谱中的红移表明其正在远离地球。
