nebulae

简明释义

英[ˈnebjʊˌliː]美[ˈnebjʊli]

n. 星云（nebula 的复数）

英英释义

单词用法

同义词

反义词

例句

1.The expansive Seagull (upper left) is itself composed of two major cataloged emission nebulae.

广阔的“海鸥”(左上)本身由两个较大的被编目的发射星云组成。

2.How planetary nebulae can form such complex structures, however, is a hot debate among professional astronomers such as Jacoby.

然而，关于行星星云如何形成这么复杂的结构，却在Jacoby等专业天文学家中引发了一场热烈的争论。

3.Basic organic (life) chemicals such as amino acids have been detected in nebulae and meteorites (see meteors).

构成生命组织的基本化学物如氨基酸，在星云和陨石中也被发现。

4.Brightclusters and nebulae abound in the northern constellation of Auriga.

御夫座北部有大量明亮的星团和星云。

5.This dark tower, NGC 6231, and associated nebulae are about 5, 000 light-years away.

这座暗黑之塔NGC 6231和与之相连的星云距我们大约 5000 光年远。

6.Separated by a dark cloud of obscuring dust, the two bright nebulae are about 1,500 light-years away.

这两个明亮的星云相距1500光年，中间隔着一片模糊尘埃的暗云。

7.These nebulae, which are not technically related to planets, are gas clouds forced outward by a dying star.

行星状星云实际上是一些即将消亡的恒星抛射出的气体外壳，在学术上与行星并没有什么关系。

8.The study of nebulae helps scientists understand the life cycle of stars.

对星云的研究帮助科学家理解恒星的生命周期。

9.Astronomers use telescopes to observe distant nebulae.

天文学家使用望远镜观察遥远的星云。

10.The Orion nebulae is one of the brightest and most studied regions in the night sky.

猎户座星云是夜空中最明亮和研究最多的区域之一。

11.Many nebulae are stellar nurseries where new stars are born.

许多星云是恒星诞生的摇篮。

12.Some nebulae emit light due to ionized gas, creating beautiful colors.

一些星云由于电离气体发光，形成美丽的颜色。

作文

The universe is a vast and mysterious place, filled with countless wonders that continue to fascinate astronomers and stargazers alike. One of the most captivating phenomena in the cosmos is the existence of nebulae, which are essentially massive clouds of gas and dust in space. These celestial formations are not only beautiful but also play a crucial role in the life cycle of stars. Understanding nebulae can provide us with insights into the origins of our own solar system and the processes that govern star formation.Nebulae can be categorized into several types, including emission, reflection, and dark nebulae. Emission nebulae are composed of ionized gases that emit light of various colors, creating stunning visual displays that can often be seen from Earth. For example, the Orion Nebula is one of the brightest and most famous emission nebulae, located in the Orion constellation. Its vibrant colors and intricate structures make it a favorite target for both amateur and professional astronomers.Reflection nebulae, on the other hand, do not emit their own light but instead reflect the light of nearby stars. This gives them a more subdued appearance compared to emission nebulae. An excellent example of a reflection nebula is the Witch Head Nebula, which reflects the light of the bright star Rigel, creating a beautiful blue glow.Dark nebulae are even more enigmatic. These are dense clouds of dust and gas that block the light from stars and other objects behind them. They appear as dark patches against the backdrop of the night sky. The Horsehead Nebula is a well-known dark nebula that takes the shape of a horse's head, making it one of the most photographed objects in the universe.The study of nebulae is essential for understanding stellar evolution. Many nebulae are regions where new stars are born. Within these clouds of gas and dust, gravity pulls material together, leading to the formation of protostars. Over time, as these protostars gather more mass, they can ignite nuclear fusion in their cores, becoming fully-fledged stars. This process is a fundamental aspect of the cosmic cycle, where old stars die and new ones are born from the remnants of their predecessors.Furthermore, nebulae also serve as laboratories for studying the chemical composition of the universe. The gases and dust found in nebulae contain a variety of elements, including hydrogen, helium, and heavier elements produced by previous generations of stars. By analyzing the light emitted or absorbed by these clouds, astronomers can learn about the conditions that existed in the early universe and how the elements necessary for life were formed.In conclusion, nebulae are not just beautiful objects in the night sky; they are fundamental to our understanding of the universe. From being the birthplace of stars to serving as repositories of cosmic history, nebulae hold the key to many astronomical mysteries. As we continue to explore the cosmos with advanced telescopes and space missions, our knowledge of nebulae will undoubtedly expand, revealing even more about the intricate tapestry of the universe we inhabit.

宇宙是一个广阔而神秘的地方，充满了无数的奇观，继续吸引着天文学家和观星者。宇宙中最迷人的现象之一是存在星云，它们本质上是太空中巨大的气体和尘埃云。这些天体不仅美丽，而且在恒星的生命周期中发挥着至关重要的作用。理解星云可以为我们提供关于我们自己太阳系起源及恒星形成过程的见解。星云可以分为几种类型，包括发射星云、反射星云和暗星云。发射星云由电离气体组成，发出各种颜色的光，创造出令人惊叹的视觉效果，通常可以从地球上看到。例如，猎户座星云是最明亮和最著名的发射星云之一，位于猎户座星座。它的鲜艳色彩和复杂结构使其成为业余和专业天文学家的最爱目标。反射星云则不同，它们不发出自己的光，而是反射附近恒星的光。这使得它们与发射星云相比，外观更加柔和。女巫头星云就是一个很好的反射星云的例子，它反射明亮的星星Rigel的光，创造出美丽的蓝色光辉。暗星云更为神秘。这些是密集的尘埃和气体云，阻挡了后面恒星和其他物体的光。它们在夜空的背景下呈现为黑暗的斑点。马头星云是一个著名的暗星云，其形状像马的头部，使其成为宇宙中被拍摄最多的天体之一。对星云的研究对于理解恒星演化至关重要。许多星云是新恒星诞生的区域。在这些气体和尘埃的云中，重力将物质聚集在一起，导致原恒星的形成。随着时间的推移，当这些原恒星积累更多的质量时，它们可以在核心点燃核聚变，成为完全成熟的恒星。这个过程是宇宙循环的基本方面，旧恒星死亡，新恒星从前辈的残骸中诞生。此外，星云还作为研究宇宙化学成分的实验室。星云中的气体和尘埃含有多种元素，包括氢、氦以及由前几代恒星产生的较重元素。通过分析这些云发出的或被吸收的光，天文学家可以了解早期宇宙中存在的条件以及生命所需元素是如何形成的。总之，星云不仅仅是夜空中美丽的天体；它们对我们理解宇宙至关重要。从作为恒星的摇篮到作为宇宙历史的储存库，星云掌握着许多天文奥秘。随着我们继续通过先进的望远镜和太空任务探索宇宙，我们对星云的知识无疑会扩展，揭示出我们所居住的宇宙错综复杂的织锦的更多信息。