astronomical unit

简明释义

天文单位(用太阳与地球的平均距离为单位

英英释义

例句

1.One astronomical unit is equivalent to approximately 93 million miles.

一个天文单位大约相当于9300万英里。

2.Astronomers use astronomical units to describe distances between planets.

天文学家用天文单位来描述行星之间的距离。

3.When measuring distances in space, scientists often use the astronomical unit for convenience.

在测量太空中的距离时，科学家们通常使用天文单位以方便计算。

4.The planet Venus is about 0.72 astronomical units away from the Sun.

金星离太阳大约是0.72天文单位。

5.The average distance from the Earth to the Sun is about 1 astronomical unit.

地球到太阳的平均距离大约是1天文单位。

作文

The universe is vast and filled with countless celestial bodies, each with its own unique characteristics and distances from one another. To help us understand these immense distances, astronomers use various units of measurement, one of which is the astronomical unit (AU). An astronomical unit is defined as the average distance between the Earth and the Sun, approximately 93 million miles or about 150 million kilometers. This unit provides a convenient way to express distances within our solar system, allowing for easier comparisons and calculations.When we think about the scale of our solar system, the astronomical unit becomes crucial. For instance, the distance from the Earth to Mars varies significantly depending on their positions in their respective orbits. At their closest approach, Mars can be about 0.52 AU away, while at their farthest, it can stretch to about 2.5 AU. This variability highlights the importance of using the astronomical unit as a standard measure, as it helps astronomers communicate distances more effectively.Furthermore, the astronomical unit is not only useful for measuring distances within our solar system but also serves as a reference point for distances to stars and other galaxies. For example, Proxima Centauri, the closest known star to the Sun, is located approximately 4.24 light-years away. In terms of astronomical units, this distance translates to about 268,000 AU. Such conversions are essential for astronomers when they attempt to study the universe beyond our solar system.In recent years, advancements in technology have allowed scientists to measure distances with even greater precision. The astronomical unit has become a fundamental part of many astronomical calculations, including those involving the gravitational forces between celestial objects, the orbits of planets, and the trajectories of spacecraft.Moreover, understanding the astronomical unit aids in the exploration of exoplanets—planets that orbit stars outside our solar system. By knowing how to convert distances into AU, researchers can better assess the habitability of these distant worlds and their potential for supporting life. The search for exoplanets has become a significant focus in modern astronomy, and the astronomical unit plays a vital role in this ongoing quest.In conclusion, the astronomical unit is an indispensable tool in the field of astronomy. It simplifies the process of measuring vast distances in space, enhances our understanding of the solar system, and facilitates communication among scientists. As we continue to explore the cosmos, the astronomical unit will remain a key concept, helping us to navigate the complexities of the universe and our place within it.

宇宙浩瀚，充满了无数天体，每个天体都有其独特的特征和彼此之间的距离。为了帮助我们理解这些巨大的距离，天文学家使用了各种测量单位，其中之一就是天文单位（AU）。天文单位被定义为地球与太阳之间的平均距离，约为9300万英里或约1.5亿公里。这个单位提供了一种方便的方式来表达我们太阳系内的距离，使得比较和计算变得更加容易。当我们考虑太阳系的规模时，天文单位显得尤为重要。例如，地球到火星的距离在它们各自轨道的位置不同的情况下变化很大。在它们最接近的时候，火星的距离可以约为0.52 AU，而在最远的时候，可以达到约2.5 AU。这种变化突显了使用天文单位作为标准测量的重要性，因为它帮助天文学家更有效地交流距离。此外，天文单位不仅对测量我们太阳系内的距离有用，还作为测量恒星和其他星系距离的参考点。例如，离太阳最近的已知恒星比邻星大约位于4.24光年之外。换算成天文单位，这个距离大约为268,000 AU。这种转换对于天文学家研究超出我们太阳系的宇宙是至关重要的。近年来，科技的进步使科学家能够以更高的精度测量距离。天文单位已经成为许多天文计算的基础部分，包括涉及天体之间的引力、行星的轨道以及航天器的轨迹。此外，理解天文单位有助于探索系外行星——那些绕着太阳系外恒星运行的行星。通过了解如何将距离转换为AU，研究人员可以更好地评估这些遥远世界的宜居性及其支持生命的潜力。寻找系外行星已成为现代天文学的一个重要焦点，而天文单位在这一持续的探索中发挥着至关重要的作用。总之，天文单位是天文学领域中不可或缺的工具。它简化了测量宇宙中巨大距离的过程，增强了我们对太阳系的理解，并促进了科学家之间的交流。随着我们继续探索宇宙，天文单位将始终是一个关键概念，帮助我们驾驭宇宙的复杂性以及我们在其中的地位。