active nucleus

简明释义

1. 放射性核; 2. 活化核;

英英释义

例句

1.The presence of an active nucleus 活跃核 in a black hole can lead to the formation of jets that travel at nearly the speed of light.

黑洞中存在的活跃核 active nucleus 可以导致以接近光速旅行的喷流形成。

2.Scientists are studying the active nucleus 活跃核 of neurons to understand how they transmit signals.

科学家们正在研究神经元的活跃核 active nucleus 以了解它们如何传递信号。

3.In astrophysics, an active nucleus 活跃核 can emit significant amounts of radiation, indicating its energetic processes.

在天体物理学中，活跃核 active nucleus 可以发出大量辐射，表明其能量过程。

4.The research team discovered that the active nucleus 活跃核 of the cell plays a crucial role in gene expression.

研究团队发现，细胞的活跃核 active nucleus 在基因表达中起着关键作用。

5.The active nucleus 活跃核 of a galaxy is often surrounded by a disk of gas and dust.

一个星系的活跃核 active nucleus 通常被气体和尘埃的盘状结构包围。

作文

In the vast realm of astrophysics, the term active nucleus refers to the central region of a galaxy that emits an extraordinary amount of energy, often outshining the rest of the galaxy. This phenomenon is primarily observed in active galactic nuclei (AGN), where the core of the galaxy is powered by a supermassive black hole. The active nucleus is surrounded by an accretion disk of gas and dust, which spirals inward due to the immense gravitational pull of the black hole. As material falls into the black hole, it heats up and emits radiation across the electromagnetic spectrum, including visible light, X-rays, and radio waves.The study of active nuclei is crucial for understanding the evolution of galaxies and the universe as a whole. These energetic regions provide insight into how black holes grow and influence their surrounding environments. For instance, the energy output from an active nucleus can affect star formation rates in the host galaxy, either triggering bursts of star formation or suppressing it through intense radiation and outflows.One of the most fascinating aspects of active nuclei is their diversity. They can be categorized into several types based on their characteristics and the mechanisms powering them. Quasars, for example, are a type of active nucleus that are among the most luminous objects in the universe. Their brightness can be attributed to the enormous amounts of matter being consumed by the black hole, resulting in powerful jets of particles being ejected at nearly the speed of light.Another interesting category is the Seyfert galaxies, which contain active nuclei that are less luminous than quasars but still exhibit significant activity. These galaxies often show broad emission lines in their spectra, indicating the presence of high-velocity gas in the vicinity of the black hole. Understanding these different types of active nuclei allows astronomers to piece together the complex puzzle of galaxy formation and evolution.Research on active nuclei has also led to advancements in observational techniques and technology. Instruments like the Hubble Space Telescope and ground-based observatories have allowed scientists to study these distant cosmic phenomena in unprecedented detail. By observing the light emitted from active nuclei, astronomers can infer properties such as the mass of the black hole, the rate of accretion, and the dynamics of the surrounding gas.Moreover, the study of active nuclei has implications beyond astronomy. The physics governing these energetic regions touches upon fundamental concepts in cosmology, high-energy physics, and even the behavior of matter under extreme conditions. As we continue to explore the universe, understanding active nuclei will remain a key focus, shedding light on the mysteries of black holes and their role in shaping the cosmos.In conclusion, the concept of active nucleus is central to our understanding of the universe. These dynamic regions not only illuminate the nature of black holes but also provide a window into the processes that govern galaxy formation and evolution. As research progresses, the knowledge gained from studying active nuclei will undoubtedly enhance our comprehension of the cosmos and our place within it.

在广袤的天体物理学领域，术语active nucleus指的是一个银河系的中心区域，其发出异常大量的能量，往往比银河系的其他部分更为耀眼。这种现象主要在活跃星系核（AGN）中观察到，其中银河系的核心由一个超大质量黑洞提供动力。active nucleus周围环绕着一个气体和尘埃的吸积盘，这些物质由于黑洞巨大的引力而螺旋向内。当物质落入黑洞时，它会加热并在电磁波谱的各个范围内发射辐射，包括可见光、X射线和无线电波。对active nuclei的研究对于理解银河系及整个宇宙的演化至关重要。这些充满能量的区域提供了关于黑洞如何增长及其如何影响周围环境的洞察。例如，来自active nucleus的能量输出可以影响宿主银河系中的恒星形成率，既可以通过强烈的辐射和喷流触发恒星形成的爆发，也可以抑制恒星形成。active nuclei的一个最迷人的方面是它们的多样性。根据其特征和驱动机制，它们可以被分为几种类型。例如，类星体是一种active nucleus，是宇宙中最亮的天体之一。它们的亮度可以归因于大量物质被黑洞吞噬，导致以接近光速喷射的粒子强大喷流。另一个有趣的类别是塞弗特星系，这些星系包含的active nuclei比类星体亮度低，但仍然表现出显著的活动。这些星系的光谱常常显示出宽发射线，表明在黑洞附近存在高速气体。理解这些不同类型的active nuclei使天文学家能够拼凑出银河系形成和演化的复杂拼图。对active nuclei的研究还推动了观测技术和技术的进步。哈勃太空望远镜和地面观测台等仪器使科学家能够以前所未有的细节研究这些遥远的宇宙现象。通过观察从active nuclei发出的光，天文学家可以推断出黑洞的质量、吸积速率和周围气体的动态等特性。此外，研究active nuclei还对天文学之外的领域产生了影响。支配这些充满活力的区域的物理学涉及宇宙学、高能物理学，甚至是极端条件下物质的行为。随着我们继续探索宇宙，理解active nuclei将始终是一个关键焦点，为揭示黑洞的奥秘和它们在塑造宇宙中的作用提供启示。总之，active nucleus的概念是我们理解宇宙的核心。这些动态区域不仅照亮了黑洞的本质，还为我们提供了关于银河系形成和演化过程的窗口。随着研究的进展，从研究active nuclei中获得的知识无疑将增强我们对宇宙的理解以及我们在其中的位置。