planetesimal

简明释义

英[ˌplænəˈtesɪməl]美[ˌplænəˈtesɪml;ˌplænətezɪml]

adj. 星子的；星子组成的；小行星体的

n. 小行星体；星子

英英释义

单词用法

同义词

反义词

例句

1.When the planetary migration occurs under the tidally interaction of a planet and a disk of gas or a planetesimal, the orbital parameters, especially, semi-major axis, of this planet will be altered.

行星迁移发生在行星与气体或星子的星盘之间进行潮汐相互作用时，这造成行星轨道参数，特别是半主轴的变更。

2.When the planetary migration occurs under the tidally interaction of a planet and a disk of gas or a planetesimal, the orbital parameters, especially, semi-major axis, of this planet will be altered.

行星迁移发生在行星与气体或星子的星盘之间进行潮汐相互作用时，这造成行星轨道参数，特别是半主轴的变更。

3.Thus, if the majority of the small amounts of water in a planetesimal reaches a planetary surface as its magma solidifies, this would be enough to form oceans that are similar to Earth's.

因此一个行星表面大部分的微量水元素到达岩浆的表面就凝固了，这将足够形成像地球上这样的海洋。

4.The formation of planets is believed to begin with the aggregation of small bodies called planetesimals.

行星的形成被认为是从称为行星胚体的小天体聚集开始的。

5.Scientists study planetesimals to understand the early solar system's development.

科学家研究行星胚体以了解早期太阳系的发展。

6.The collisions between planetesimals can lead to the creation of larger planetary bodies.

在行星胚体之间的碰撞可以导致更大行星体的形成。

7.Some researchers believe that planetesimals may contain organic compounds essential for life.

一些研究人员认为，行星胚体可能含有生命所需的有机化合物。

8.The study of planetesimals helps astronomers understand how our planet formed.

对行星胚体的研究帮助天文学家理解我们的星球是如何形成的。

作文

In the vast expanse of our universe, the formation of celestial bodies is a fascinating process that has intrigued astronomers and scientists for centuries. One of the key concepts in understanding how planets, moons, and other astronomical objects come into existence is the idea of planetesimal. A planetesimal is defined as a small body from which a planet originates in the early stages of development. These tiny building blocks are crucial in the formation of larger planetary bodies. The theory of planetesimals suggests that they formed from the dust and gas left over after the Big Bang, coalescing over millions of years through gravitational attraction. As these particles grew in size, they began to collide with one another, forming larger aggregates. This process is known as accretion, and it plays a vital role in the creation of planets. In the early solar system, billions of planetesimals existed, drifting through space and gradually merging to create larger protoplanets. The dynamics of this process were complex, influenced by various factors such as gravity, temperature, and the presence of other celestial bodies. Scientists believe that the interactions between these planetesimals led to the diverse array of planets we observe today. For example, the inner solar system, where Earth resides, is composed of rocky planets, while the outer solar system is home to gas giants. This differentiation can be attributed to the varying conditions that existed during the formation of these planetesimals. Moreover, the study of planetesimals provides valuable insights into the history of our own planet. By examining meteorites, which are remnants of these ancient bodies, researchers can gain a better understanding of the materials that contributed to Earth's formation. Some meteorites are believed to be direct fragments of planetesimals, offering a glimpse into the primordial conditions of the early solar system. The significance of planetesimals extends beyond our solar system. Astronomers have observed similar processes occurring in distant star systems, where young stars are surrounded by disks of gas and dust. These disks are thought to harbor their own planetesimals, which may eventually lead to the formation of new planets. This ongoing research into planetesimals not only enhances our understanding of planetary formation but also raises intriguing questions about the possibility of extraterrestrial life. If planetesimals are fundamental in creating habitable worlds, then studying them could help identify other systems that might support life. In conclusion, planetesimals are essential components in the cosmic puzzle of planetary formation. Their role in the early solar system and beyond highlights the intricate processes that govern the universe. As we continue to explore and learn more about these fascinating bodies, we deepen our understanding of not only our own planet's origins but also the potential for life elsewhere in the cosmos. The study of planetesimals is a testament to the wonders of science and the endless curiosity that drives humanity to explore the unknown.

在我们宇宙的广袤空间中，天体的形成是一个迷人的过程，这个过程吸引了几个世纪以来的天文学家和科学家的兴趣。理解行星、卫星和其他天文物体如何存在的关键概念之一是planetesimal的概念。planetesimal被定义为在早期发展阶段中，一个行星起源的小天体。这些微小的构建块在形成更大的行星体中至关重要。 planetesimals理论表明，它们是由大爆炸后留下的尘埃和气体形成的，经过数百万年的时间通过引力吸引而聚集在一起。当这些粒子逐渐增大时，它们开始相互碰撞，形成更大的聚合体。这个过程被称为聚集，它在行星的形成中发挥着重要作用。 在早期的太阳系中，存在数十亿个planetesimals，它们在空间中漂流，并逐渐合并形成更大的原行星。这个过程的动态非常复杂，受到重力、温度和其他天体存在等各种因素的影响。科学家们相信，这些planetesimals之间的相互作用导致了我们今天观察到的多样化行星。例如，地球所在的内太阳系由岩石行星组成，而外太阳系则是气体巨星的家园。这种差异可以归因于在这些planetesimals形成过程中存在的不同条件。 此外，研究planetesimals为我们自己的星球历史提供了宝贵的见解。通过研究陨石，这些古老天体的残余，研究人员可以更好地了解对地球形成贡献的材料。一些陨石被认为是planetesimals的直接碎片，提供了对早期太阳系原始条件的窥视。 planetesimals的重要性超越了我们自己的太阳系。天文学家已经观察到类似的过程发生在遥远的恒星系统中，年轻的恒星周围被气体和尘埃的盘环绕。这些盘被认为蕴含着自己的planetesimals，它们可能最终导致新行星的形成。对planetesimals的持续研究不仅增强了我们对行星形成的理解，还提出了关于外星生命可能性的有趣问题。如果planetesimals在创造宜居世界中是基础，那么研究它们可能有助于识别其他可能支持生命的系统。 总之，planetesimals是行星形成宇宙拼图中的重要组成部分。它们在早期太阳系及其以外的角色突显了支配宇宙的复杂过程。随着我们继续探索并了解更多关于这些迷人天体的信息，我们加深了对自己星球起源的理解，也对宇宙中其他生命的潜力有了更深入的认识。对planetesimals的研究是科学奇迹和推动人类探索未知的无尽好奇心的证明。