登录
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
a piece of rock coming from outer space that passes through the Earth's atmosphere, producing light
流星
any of the rocky bodies orbiting the sun, ranging greatly in diameter, also found in large numbers between Jupiter and Mars
小行星
a glowing cloud of gas and dust in outer space, often the result of a star explosion or formation
星云
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
a specific group of stars that form a pattern and have a name related to their shape
星座
(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
the displacement of the spectrum of an astronomical object toward shorter wavelengths, indicating motion toward the observer
蓝移
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
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
the scientific study of how the universe is created, its development, and how it is going to end
宇宙学
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
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
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
光谱仪
a galaxy that lacks a distinct, regular shape or structure, often appearing chaotic and asymmetrical
不规则星系
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
不明飞行物体
an unmanned spacecraft designed to explore outer space, gather scientific data, and transmit it back to Earth
空间探测器
a layer of charged particles, primarily electrons and protons, held in place around a celestial body by its magnetic field
辐射带
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
