periodic comet

简明释义

周期彗星

英英释义

例句

1.In 1986, the world witnessed the close approach of Halley's periodic comet 周期彗星.

1986年，世界见证了哈雷周期彗星 周期彗星的近距离接触。

2.Some periodic comets 周期彗星 have orbits that bring them close to the Sun.

一些周期彗星 周期彗星的轨道使它们靠近太阳。

3.Astronomers study periodic comets 周期彗星 to understand the early solar system.

天文学家研究周期彗星 周期彗星以理解早期的太阳系。

4.Halley's Comet is one of the most famous periodic comets 周期彗星 that can be seen from Earth every 76 years.

哈雷彗星是最著名的一个周期彗星 周期彗星，每76年可以在地球上看到一次。

5.The return of a periodic comet 周期彗星 can create excitement among stargazers.

一颗周期彗星 周期彗星的回归能引起天文爱好者的兴奋。

作文

A periodic comet is a celestial body that orbits the Sun and returns to the inner solar system at regular intervals. These comets are fascinating objects of study in astronomy because they provide insights into the early solar system and the composition of primordial materials. The most famous example of a periodic comet is Halley's Comet, which has an orbital period of approximately 76 years. This comet can be seen from Earth with the naked eye, and its appearances have been recorded for centuries, making it a significant object in both scientific study and cultural history.The nature of a periodic comet lies in its unique orbit, which is often highly elliptical. This means that it spends a significant amount of time far from the Sun, typically in the Oort Cloud or Kuiper Belt, before making a dramatic approach towards the Sun. As it nears the Sun, the heat causes the comet's ices to vaporize, creating a glowing coma and sometimes a tail that can stretch for millions of kilometers. This transformation is not just visually stunning; it also allows astronomers to study the chemical composition of the comet, which can shed light on the conditions present during the formation of the solar system.Understanding periodic comets is important for several reasons. Firstly, they are considered to be time capsules of the early solar system. By analyzing their materials, scientists can gain insights into the building blocks of planets and the origins of water and organic molecules on Earth. Secondly, periodic comets can pose potential threats to our planet if their orbits bring them too close to Earth. Monitoring their paths helps in assessing any risks and preparing for possible impacts.Moreover, the study of periodic comets has also led to advancements in technology and methodologies in astronomy. Observations of these comets require precise calculations and sophisticated equipment, which has driven innovation in telescopes and imaging techniques. Recent missions, such as the Rosetta mission to comet 67P/Churyumov-Gerasimenko, have provided unprecedented data about the surface and composition of comets, further enhancing our understanding of these celestial wanderers.In addition to their scientific significance, periodic comets hold a special place in human culture. Throughout history, comets have been viewed with awe and wonder, often interpreted as omens or messengers. Their appearances have inspired countless myths, legends, and works of art. For instance, Halley's Comet has appeared in historical records, including the Bayeux Tapestry, which commemorates the Norman Conquest of England in 1066. This cultural impact illustrates how periodic comets bridge the gap between science and humanity, reminding us of our connection to the cosmos.In conclusion, periodic comets are not just astronomical phenomena; they are vital to our understanding of the universe and our place within it. Their predictable orbits allow us to study them regularly, leading to discoveries that enhance our knowledge of the solar system's history and evolution. As we continue to explore these celestial bodies, we uncover more about the origins of our planet and the processes that govern our cosmic neighborhood. The allure of periodic comets will undoubtedly continue to inspire both scientists and the general public for generations to come.

周期性彗星是围绕太阳运行并以规律的时间间隔返回内太阳系的天体。这些彗星是天文学研究中的迷人对象，因为它们提供了关于早期太阳系和原始材料组成的见解。最著名的例子是哈雷彗星，其轨道周期约为76年。这颗彗星可以用肉眼从地球上看到，其出现已被记录了几个世纪，使其在科学研究和文化历史中都具有重要意义。周期性彗星的本质在于其独特的轨道，通常是高度椭圆形的。这意味着它在远离太阳的地方花费大量时间，通常在奥尔特云或库伊伯带中，然后戏剧性地接近太阳。当它靠近太阳时，热量使彗星的冰蒸发，形成发光的彗发，有时还有一条可以延伸数百万公里的尾巴。这种转变不仅视觉上令人惊叹；它还允许天文学家研究彗星的化学成分，这可以揭示太阳系形成时的条件。理解周期性彗星非常重要，原因有几个。首先，它们被认为是早期太阳系的时间胶囊。通过分析它们的材料，科学家可以获得关于行星构建块以及地球上水和有机分子起源的见解。其次，周期性彗星可能对我们的星球构成潜在威胁，如果它们的轨道使它们离地球太近。监测它们的路径有助于评估任何风险并为可能的撞击做准备。此外，周期性彗星的研究还推动了天文学中的技术和方法的进步。这些彗星的观察需要精确的计算和复杂的设备，这推动了望远镜和成像技术的创新。最近的任务，例如罗塞塔号探测器对67P/丘留莫夫-赫拉西门科彗星的任务，提供了关于彗星表面和组成的前所未有的数据，进一步增强了我们对这些天体的理解。除了科学意义，周期性彗星在文化中也占有特殊地位。在历史上，彗星常常以敬畏和惊奇的目光看待，通常被解读为预兆或信使。它们的出现激发了无数神话、传说和艺术作品。例如，哈雷彗星在历史记录中出现，包括贝叶兹挂毯，该挂毯纪念1066年诺曼征服英格兰。这种文化影响力说明了周期性彗星如何弥合科学与人类之间的差距，提醒我们与宇宙的联系。总之，周期性彗星不仅仅是天文现象；它们对我们理解宇宙及其在其中的位置至关重要。它们可预测的轨道使我们能够定期研究它们，从而发现增强我们对太阳系历史和演变知识的发现。随着我们继续探索这些天体，我们揭示了更多关于我们星球起源和支配我们宇宙邻域过程的信息。周期性彗星的魅力无疑将继续激励科学家和公众几代人。