proper motion

简明释义

实际航程正常运动

英英释义

例句

1.The star's proper motion 自行运动 was measured using advanced telescopes.

通过先进的望远镜测量了这颗星星的proper motion 自行运动。

2.Calculating proper motion 自行运动 helps astronomers predict the future positions of stars.

计算proper motion 自行运动帮助天文学家预测恒星的未来位置。

3.Astronomers study proper motion 自行运动 to understand the dynamics of star clusters.

天文学家研究proper motion 自行运动以理解星团的动态。

4.The proper motion 自行运动 of nearby stars can indicate their distance from Earth.

附近恒星的proper motion 自行运动可以指示它们与地球的距离。

5.The proper motion 自行运动 of the Andromeda Galaxy is an interesting topic for researchers.

仙女座星系的proper motion 自行运动是研究人员感兴趣的话题。

作文

The universe is an intricate tapestry of stars, galaxies, and celestial phenomena that have fascinated humans for centuries. Among the many concepts in astronomy, proper motion plays a crucial role in understanding how stars move across the sky. Proper motion (适当运动) refers to the apparent motion of a star against the background of more distant stars, measured in angular terms over time. This movement is typically expressed in arcseconds per year and is a result of both the star's actual motion through space and the observer's perspective from Earth.To grasp the significance of proper motion, it is essential to differentiate it from other forms of stellar motion. For instance, there is also radial motion, which describes how fast a star is moving towards or away from us. While radial motion can be measured using the Doppler effect, proper motion is determined by direct observation as the star shifts position relative to its background. This distinction is vital for astronomers trying to map out the motions of stars and understand their dynamics within the galaxy.The concept of proper motion has historical roots that date back to the early observations of stars. One of the first stars to have its proper motion measured was Barnard's Star, which was found to have a remarkably high proper motion. This discovery not only highlighted the star's proximity to Earth but also opened up new avenues for studying stellar kinematics. By observing the proper motion of various stars, astronomers can infer information about their distances, velocities, and even their trajectories through the Milky Way.In practical applications, measuring proper motion has profound implications for our understanding of the structure and evolution of the galaxy. For example, stars that exhibit significant proper motion are often closer to us than those that do not. This information helps astronomers create more accurate models of the Milky Way's composition and formation. Additionally, tracking the proper motion of stars can reveal gravitational interactions between them, shedding light on phenomena such as binary star systems and star clusters.Moreover, the study of proper motion is not limited to individual stars; it extends to entire star clusters and galaxies. By analyzing the collective proper motion of stars within a cluster, astronomers can determine the cluster's overall dynamics and its evolution over time. This research contributes to our broader understanding of cosmic structures and the forces that shape them.As technology advances, the tools available for measuring proper motion have become increasingly sophisticated. Space-based observatories like the Hubble Space Telescope and the Gaia mission have revolutionized our ability to observe and measure the proper motion of stars with unprecedented precision. These advancements allow astronomers to compile extensive catalogs of stellar motions, paving the way for future discoveries.In conclusion, proper motion is a fundamental concept in the field of astronomy that provides valuable insights into the movement of stars across the cosmos. Understanding proper motion enables astronomers to unravel the mysteries of the universe, from the dynamics of individual stars to the intricate dance of galaxies. As we continue to explore the night sky, the significance of proper motion will undoubtedly remain a cornerstone of our quest to comprehend the vastness of space.

宇宙是由星星、星系和天体现象构成的复杂织锦，几个世纪以来一直吸引着人类的注意。在天文学的众多概念中，proper motion（适当运动）在理解恒星在天空中的运动方面起着至关重要的作用。Proper motion指的是恒星相对于更遥远的恒星背景的表观运动，通常以角度单位随时间进行测量。这个运动通常用每年弧秒表示，是恒星在空间中实际运动和观察者从地球的视角共同作用的结果。要理解proper motion的重要性，有必要将其与其他形式的恒星运动区分开。例如，还有径向运动，它描述了一颗恒星朝向或远离我们的速度。虽然可以使用多普勒效应测量径向运动，但proper motion是通过直接观察确定的，因为恒星相对于背景的位置发生变化。这种区别对于试图绘制恒星运动图并理解它们在银河系内的动力学的天文学家至关重要。Proper motion的概念有着悠久的历史，可以追溯到早期的恒星观测。巴纳德星是第一颗被测量proper motion的恒星之一，发现其具有显著的高proper motion。这一发现不仅突显了该恒星与地球的接近性，还开启了研究恒星运动学的新途径。通过观察各种恒星的proper motion，天文学家可以推断出有关其距离、速度甚至轨迹的信息。在实际应用中，测量proper motion对我们理解银河系的结构和演化具有深远的影响。例如，表现出显著proper motion的恒星通常比那些没有明显运动的恒星离我们更近。这一信息帮助天文学家创建更准确的银河系组成和形成模型。此外，跟踪恒星的proper motion可以揭示它们之间的引力相互作用，从而阐明双星系统和星团等现象。此外，proper motion的研究不仅限于单个恒星；它扩展到整个星团和星系。通过分析星团内恒星的集体proper motion，天文学家可以确定该星团的整体动力学及其随时间的演变。这项研究有助于我们更广泛地理解宇宙结构及其塑造力量。随着技术的进步，测量proper motion的工具变得越来越复杂。像哈勃太空望远镜和盖亚任务这样的基于空间的观测站彻底改变了我们观察和测量恒星proper motion的能力，以前所未有的精确度进行测量。这些进步使天文学家能够编制大量恒星运动的目录，为未来的发现铺平了道路。总之，proper motion是天文学领域的一个基本概念，为我们提供了关于恒星在宇宙中运动的宝贵见解。理解proper motion使天文学家能够揭开宇宙的奥秘，从单颗恒星的动力学到星系的复杂舞蹈。随着我们继续探索夜空，proper motion的重要性无疑将继续成为我们理解宇宙浩瀚的基石。