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a highly energetic celestial object emitting powerful radiation from the center of a galaxy, often associated with a supermassive black hole
类星体
a region beyond Neptune in the solar system containing icy objects like dwarf planets, asteroids, and comets
柯伊伯带
a distant, hypothetical region surrounding the solar system, thought to harbor icy bodies and comets
奥尔特云
the outer layer of the Sun's atmosphere, observable as a plasma halo during a solar eclipse
恒星日冕
the apparent path that the Sun traces in the sky over the course of a year, which is also the plane of the Earth's orbit around the Sun
黄道
the apparent displacement or difference in the apparent position of an object when viewed along two different lines of sight, often used in astronomy to measure the distance of nearby stars
视差
an exploding star that as a result is emitting a very large amount of light, more than the sun
超新星
a highly magnetized, rotating neutron star that emits beams of electromagnetic radiation from its magnetic poles
脉冲星
the lowest layer of Earth's atmosphere, extending from the surface up to an average altitude of about 8-15 kilometers
对流层
the atmospheric layer above the troposphere, where temperature generally increases with altitude and the ozone layer is situated
平流层
the atmospheric layer above the stratosphere, where temperatures decrease with altitude and it extends up to the mesopause
中间层
the atmospheric layer above the mesosphere, where temperatures increase with altitude and it extends to the exosphere
热层
a layer in the upper atmosphere containing ions and free electrons, affecting radio communication and contributing to auroras
电离层
the outermost layer of Earth's atmosphere, transitioning to outer space, with extremely low gas densities
外逸层
the protective magnetic field region around a celestial body, shielding it from solar wind and charged particles
磁层
