The range of turbulent velocities determines the relative proportion of small and large.
星体大小的比例由乱流速度的快慢决定.
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They do so by combining quasar spectra with numerical simulations of structure formation.
他们的做法是将类星体光谱和结构形成的数值模拟结果结合在一起.
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Quasars are optical and sources of enormous intensity, apparently at great distances from the earth.
类星体是极强的光源和射电源, 看上去距地球极其遥远.
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For many years, Treister says, astronomers doubted that obscured quasars were very common.
特雷斯特表示, 多年来天文学家们一直不相信被遮挡的类星体是很普遍的.
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Therefore , quasar absorption lines cosmological probes of formation and evolution of galaxies.
对类星体吸收线的研究将有助于我们了解星系的形成和演化.
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但是, 在排斥驱逐的过程中, 除非星体彼此非常紧密地束缚在一起,否则双星系统是会被拆散的.
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An active galaxy is a star system with a humongous black hole at its centre.
一个活跃的星系是一个中央部位有一个极大的黑洞的恒星体系.
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The largest asteroid is Ceres, which is about a quarter the size of the moon.
最大的小行星是谷神星,体积约为月球的1/4.
《柯林斯高阶英汉双解学习词典》
Pulsar : A dense, rapidly rotating star that emits pulses of light.
脉冲星: 高密度 、 快速旋转、发射脉冲光的星体.
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They have discovered now, previously unimagined objects-pulsars, quasars, and black holes.
他们发现了以往想象不到的新客体 ― ―脉冲星 、 类星体和黑洞.
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They have discovered now , previou sly unimagined objects-pulsars, quasars, and black holes.
他们发现了以往想象不到的新客体 —— 脉冲星 、 类星体和黑洞.
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By definition , interplanetary travel is travel between bodies in a given star system.
星系旅行是指在给定的行星系统内在不同星体间的旅行.
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