quasars
简明释义
n. [天]类星体；恒星状球体；半星球体（quasar 的复数形式）
英英释义
单词用法
活跃星系核 | |
光年远 | |
类星体辐射 | |
类星体光度 |
同义词
反义词
例句
1.In 1997 Webb's team at the University of New South Wales in Sydney analysed the light reaching Earth from distant quasars.
1997年，在悉尼新南威尔士大学，韦伯的团队分析了从遥远的类星体到达地球的光。
2.Did you know there's a black hole in the center of our galaxy? No Time Dilation for Distant Quasars? Galactic Monster Mystery solved?
你知道我们银河系中心有一个黑洞吗？别瞪大眼睛搜寻那遥远的类星体——那没用！银河系大揭秘。
3.It has measured the precise distance to a million galaxies and has discovered about 500,000 quasars.
至今它已经精确测量出了百万个星系和偶们的距离，外加发现了50万个类星体。
4.Quasars are perhaps the most ravenous and immortal beasts in the universe.
类星体就像是宇宙中最贪得无厌，最无法无天的怪家伙。
5.Quasars also seem to be surrounded by halos of dark matter, a cryptic and unseen component of all galaxies.
类星体看上去也被一些暗物质组成的“环”围绕着，这是所有星系都有的一个神秘的，看不见的组成部分。
6.Larson figures this scenario for black hole feeding probably applies to the most distant quasars, too.
拉尔森关于哺育黑洞的计算方法可能同样也适用于最遥远的那些类星体。
7.The extension of astronomy from visible light to radio waves to x-rays and gamma rays never failed to lead to the discovery of unusual objects such as radio galaxies, quasars, and pulsars.
从可见光扩展到无线电波，再到X 射线和伽马射线，天文学总是会发现不寻常的物体，如射电星系、类星体和脉冲星。
8.The research is expected to help nail down estimates of even bigger black holes associated with ancient distant galaxies known as quasars.
这项研究有助于人们对于更大体积的黑洞进行估计，而这种黑洞可能与名为类星体的古老星系有关。
9.Scientists study quasars 类星体 to understand the early universe better.
科学家研究类星体以更好地理解早期宇宙。
10.The light from quasars 类星体 can take billions of years to reach Earth.
来自类星体的光可能需要数十亿年才能到达地球。
11.The spectrum of quasars 类星体 reveals crucial information about their composition.
类星体的光谱揭示了关于其成分的重要信息。
12.Some quasars 类星体 are among the most luminous objects in the universe.
一些类星体是宇宙中最亮的天体之一。
13.Astronomers discovered several new quasars 类星体 in the distant universe.
天文学家在遥远的宇宙中发现了几颗新的类星体。
作文
In the vast expanse of the universe, there are celestial objects that continue to baffle and fascinate astronomers. Among these are quasars, which are among the most luminous and energetic entities known to exist. The term quasars is derived from 'quasi-stellar radio sources', reflecting their star-like appearance in early observations. However, they are much more than mere stars; they are actually the highly energetic cores of distant galaxies, powered by supermassive black holes at their centers.One of the most intriguing aspects of quasars is their incredible brightness. They can outshine entire galaxies, emitting vast amounts of energy across the electromagnetic spectrum, including radio waves, visible light, and X-rays. This immense luminosity makes quasars some of the most distant objects we can observe, allowing astronomers to study the early universe and gain insights into its formation and evolution.The discovery of quasars in the 1960s revolutionized our understanding of the cosmos. Initially, they were detected as strong radio sources, and it was later found that many of them also emitted visible light. As technology advanced, astronomers were able to measure their redshifts, which indicated that they were located billions of light-years away. This measurement provided evidence that quasars are not only incredibly bright but also extraordinarily distant, thus offering a glimpse into the universe's infancy.The energy output of quasars is primarily attributed to the accretion of matter onto their central black holes. As gas and dust spiral into the black hole, they heat up due to friction and gravitational forces, releasing energy in the form of radiation. This process can produce jets of particles that travel at nearly the speed of light, further contributing to the brightness of quasars. The study of these jets has opened new avenues for understanding the dynamics of galaxies and the role of black holes in cosmic evolution.Moreover, quasars serve as essential tools for probing the universe. Their immense distances make them excellent markers for studying the expansion of the universe and the distribution of dark matter. By analyzing the light from quasars as it passes through different regions of space, astronomers can infer the presence of intervening galaxies and the impact of dark matter on the universe's structure.Despite their significance, many questions remain regarding quasars. For instance, researchers are still exploring the relationship between quasars and their host galaxies. How do these powerful entities influence the formation and evolution of their surroundings? Additionally, the mechanisms behind the variability of quasars—why some appear brighter or dimmer over time—are still under investigation.In conclusion, quasars are extraordinary astronomical phenomena that provide invaluable insights into the universe. Their immense brightness, distance, and unique characteristics make them key players in our quest to understand cosmic history. As technology continues to advance, we can expect to uncover more secrets held by these enigmatic objects, further illuminating the mysteries of the universe. The study of quasars not only enhances our knowledge of astrophysics but also inspires a deeper appreciation for the vastness and complexity of the cosmos.
在宇宙的广阔空间中，有一些天体继续让天文学家感到困惑和着迷。其中之一是类星体，它们是已知的最明亮和最强大的实体之一。术语类星体来源于“准恒星射电源”，反映了它们在早期观测中的恒星般外观。然而，它们远不止是普通的恒星；它们实际上是遥远星系的高能核心，由位于其中心的超大质量黑洞提供动力。类星体最引人入胜的方面之一是它们令人难以置信的亮度。它们可以比整个星系更亮，发出大量跨越电磁波谱的能量，包括无线电波、可见光和X射线。这种巨大的光度使得类星体成为我们可以观察到的一些最遥远的物体，使天文学家能够研究早期宇宙并获得关于其形成和演化的见解。类星体在20世纪60年代的发现彻底改变了我们对宇宙的理解。最初，它们被检测为强射电源，后来发现它们中的许多也会发出可见光。随着技术的进步，天文学家能够测量它们的红移，这表明它们距离地球数十亿光年。这一测量提供了证据，表明类星体不仅极其明亮，而且异常遥远，从而提供了对宇宙幼年期的洞察。类星体的能量输出主要归因于物质向其中心黑洞的吸积。当气体和尘埃螺旋进入黑洞时，由于摩擦和引力作用，它们会加热，释放出辐射能量。这个过程可以产生以接近光速的速度移动的粒子喷流，进一步增强了类星体的亮度。对这些喷流的研究为理解星系的动态和黑洞在宇宙演化中的作用开辟了新的途径。此外，类星体作为探测宇宙的重要工具。它们的巨大距离使它们成为研究宇宙扩张和暗物质分布的优秀标记。通过分析从类星体发出的光线穿过不同空间区域时的变化，天文学家可以推断出介入星系的存在以及暗物质对宇宙结构的影响。尽管类星体具有重要意义，但仍有许多问题待解。例如，研究人员仍在探索类星体与其宿主星系之间的关系。这些强大的实体如何影响周围环境的形成和演化？此外，关于类星体变异机制的问题——为什么有些在一段时间内显得更亮或更暗——仍在调查中。总之，类星体是非凡的天文现象，为我们理解宇宙提供了宝贵的见解。它们巨大的亮度、距离和独特特征使它们成为我们探索宇宙历史的重要参与者。随着技术的不断进步，我们可以期待揭开这些神秘物体所隐藏的更多秘密，进一步照亮宇宙的奥秘。对类星体的研究不仅增强了我们对天体物理学的知识，也激发了我们对宇宙浩瀚和复杂性的更深层次的欣赏。
