pulsar

简明释义

英[ˈpʌlsɑː(r)]美[ˈpʌlsɑːr]

n. 脉冲星

复 数 p u l s a r s

英英释义

单词用法

同义词

反义词

例句

1.The mass of the Crab Pulsar is not too different from that of the sun.

蟹状星云脉冲星的,质量和太阳不差太多。

2.This star is clearly not the pulsar as it is about equally bright on both exposures.

这颗星很明显不是，中子星，因为它几乎,在两次曝光中一样亮。

3.The Crab Pulsar rotates about 30 times each second.

蟹状星云波霎每秒大约自转30次。

4.Such features are known as pulsar wind nebulas.

这种特征被称为脉冲星云。

5.We know the period of the pulsar to a very high degree of accuracy.

我们知道脉冲星周期，的精确度很高。

6.We began the project by moving several narrowly focused subprojects from DSDP and took responsibility for the Pulsar package.

项目开始时，我们仅关注DSDP的几个子项目并负责Pulsar软件包。

7.The pulsar is exotic on its own—it's a super-dense remnant of a star spinning at about 10, 000 rpm.

这颗脉冲星生来奇特，它是一颗旋转速度约10000rpm的星体的超高密度残骸。

8.Binary star systems containing a pulsar and an accretion disk occur beginning at about 14:30.

含有脉冲星和吸积盘的双星系统出现在大约1430的位置。

9.The pulsar was first discovered in 1967 by Jocelyn Bell Burnell.

这颗脉冲星于1967年由乔斯林·贝尔·伯内尔首次发现。

10.The study of pulsars has provided insights into the behavior of neutron stars.

对脉冲星的研究为中子星的行为提供了见解。

11.Astronomers discovered a new pulsar that emits radio waves every few milliseconds.

天文学家发现了一颗新的脉冲星，每几毫秒发出一次无线电波。

12.Researchers are using pulsars to detect gravitational waves.

研究人员正在利用脉冲星来探测引力波。

13.Scientists used the timing of a pulsar to test theories of gravity.

科学家利用一颗脉冲星的计时来测试引力理论。

作文

In the vast expanse of the universe, there are countless celestial phenomena that captivate the imagination of astronomers and enthusiasts alike. Among these fascinating objects is the pulsar, a highly magnetized, rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles. The discovery of pulsars has significantly advanced our understanding of stellar evolution and the nature of extreme physical conditions in space.To grasp the concept of a pulsar, one must first understand what a neutron star is. A neutron star is the remnant core of a massive star that has undergone a supernova explosion. When a star exhausts its nuclear fuel, it collapses under its own gravity, causing protons and electrons to combine into neutrons. This process results in an incredibly dense object, with a mass greater than that of the Sun compressed into a sphere the size of a city. The extraordinary density of a neutron star leads to fascinating physical phenomena, including the formation of a pulsar.The unique characteristics of a pulsar arise from its rapid rotation and strong magnetic field. As the neutron star rotates, it generates a powerful magnetic field that channels particles from its surface. These particles are accelerated along the magnetic field lines and emit radiation in the form of radio waves, X-rays, or gamma rays. The beams of radiation are not emitted uniformly but are concentrated along the magnetic poles. As the star rotates, these beams sweep across space like a lighthouse beam, creating a pulsing effect that can be detected by telescopes on Earth. This is why we refer to these objects as pulsars. The first pulsar was discovered in 1967 by Jocelyn Bell Burnell and Antony Hewish, who observed regular pulses of radio waves coming from a specific point in the sky. Initially, they thought they had discovered signals from extraterrestrial life, humorously labeling them as LGM (Little Green Men). However, further analysis revealed that these signals were indeed from a newly identified type of star, which we now know as a pulsar. Since then, thousands of pulsars have been identified, each with unique rotational periods and properties.The study of pulsars has opened new avenues in astrophysics. One of the most significant contributions is their use as cosmic clocks. The regularity of a pulsar's pulse can be utilized to test theories of gravity, measure distances in the universe, and even detect gravitational waves. Additionally, some pulsars are found in binary systems, where they interact with companion stars. These interactions provide insights into the behavior of matter under extreme conditions and the dynamics of stellar evolution.Moreover, pulsars have practical applications in technology. The precise timing of pulsar signals can be used in navigation systems and has potential implications for developing future technologies in deep-space exploration.In conclusion, pulsars are remarkable astronomical objects that not only enhance our understanding of the universe but also challenge our perceptions of physics and technology. Their existence illustrates the incredible diversity of celestial phenomena and reminds us of the mysteries that still lie beyond our reach. As we continue to explore the cosmos, pulsars will undoubtedly remain a focal point of research and discovery, shedding light on the fundamental workings of the universe and the nature of reality itself.

在宇宙的广阔空间中，有无数天体现象吸引着天文学家和爱好者的想象。其中一个迷人的天体是脉冲星，它是一种高度磁化的旋转中子星，从其磁极发出电磁辐射束。脉冲星的发现显著推进了我们对恒星演化及极端物理条件本质的理解。要理解脉冲星的概念，首先必须了解什么是中子星。中子星是经历超新星爆炸后，巨大恒星的残余核心。当一颗恒星耗尽其核燃料时，它在自身重力的作用下崩溃，导致质子和电子结合成中子。这个过程产生了一个极其致密的天体，其质量超过太阳，却压缩在一个城市大小的球体中。中子星的非凡密度导致了迷人的物理现象，包括脉冲星的形成。脉冲星的独特特性源于其快速旋转和强大的磁场。当中子星旋转时，会产生一个强大的磁场，将来自其表面的粒子引导。这些粒子沿着磁场线加速，并以无线电波、X射线或伽马射线的形式发射辐射。这些辐射束并不是均匀发射的，而是集中在磁极周围。当星体旋转时，这些辐射束像灯塔的光束一样扫过太空，产生脉冲效应，可以被地球上的望远镜探测到。这就是我们称这些天体为脉冲星的原因。第一颗脉冲星是在1967年由乔斯林·贝尔·伯内尔和安东尼·休伊什发现的，他们观察到来自天空中特定点的规律性无线电波脉冲。最初，他们认为自己发现了外星生命的信号，幽默地将其标记为LGM（小绿人）。然而，进一步分析表明，这些信号确实来自一种新识别的星体，我们现在称之为脉冲星。自那时以来，成千上万的脉冲星被识别出来，每个都有独特的旋转周期和特性。对脉冲星的研究为天体物理学开辟了新的途径。其中一个重要贡献是将其用作宇宙时钟。脉冲星脉冲的规律性可以用于测试引力理论、测量宇宙中的距离，甚至探测引力波。此外，一些脉冲星被发现处于双星系统中，它们与伴星相互作用。这些相互作用提供了对极端条件下物质行为和恒星演化动态的深入见解。此外，脉冲星在技术上也有实际应用。脉冲星信号的精确计时可用于导航系统，并对未来深空探索技术的发展具有潜在影响。总之，脉冲星是非凡的天文物体，不仅增强了我们对宇宙的理解，而且挑战了我们对物理学和技术的认知。它们的存在展示了天体现象的惊人多样性，并提醒我们仍然存在许多超出我们理解的奥秘。随着我们继续探索宇宙，脉冲星无疑将继续成为研究和发现的焦点，揭示宇宙的基本运作和现实本质。