stellar parallax

简明释义

恒星视差

英英释义

例句

1.Astronomers use stellar parallax to measure the distance of nearby stars from Earth.

天文学家使用视差来测量附近恒星与地球之间的距离。

2.By observing the stellar parallax of a star over six months, scientists can calculate its distance.

通过观察一颗恒星在六个月内的视差，科学家可以计算出它的距离。

3.In the case of Proxima Centauri, its stellar parallax indicates it is about 4.24 light-years away.

以比邻星为例，它的视差表明它距离地球约4.24光年。

4.The concept of stellar parallax was first successfully demonstrated in the 19th century.

在19世纪，视差的概念首次成功展示。

5.The stellar parallax method is crucial for determining distances to stars within a few hundred light-years.

视差方法对于确定几百光年内的恒星距离至关重要。

作文

Understanding the concept of stellar parallax is crucial for anyone interested in astronomy and the measurement of astronomical distances. Stellar parallax, defined as the apparent shift in position of a star against the background of more distant stars when observed from different positions of the Earth’s orbit, provides a fundamental method for determining the distance to nearby stars. This phenomenon occurs because as the Earth travels around the Sun, the angle from which we view a star changes slightly, creating a visual effect that can be measured. To grasp the significance of stellar parallax, one must first understand the basic principles of triangulation. Triangulation is a method used in various fields, including navigation and surveying, to determine the location of a point by forming triangles to it from known points. In the case of astronomy, the two points are the positions of the Earth at different times of the year, typically six months apart. By measuring the angle of the apparent shift of a star and knowing the baseline distance (the diameter of Earth's orbit), astronomers can calculate the distance to the star using simple trigonometry. The first successful measurement of stellar parallax was achieved in the early 19th century by astronomer Friedrich Bessel, who measured the parallax of the star 61 Cygni. His work provided the first direct evidence that stars are not fixed points of light but rather objects located at varying distances from Earth. This groundbreaking discovery opened the door to the field of astrometry, which focuses on measuring the positions and movements of celestial bodies.In modern astronomy, stellar parallax remains a vital tool, particularly for measuring the distances to stars within a few hundred light-years from Earth. With advancements in technology, such as space-based telescopes like the Hubble Space Telescope and the Gaia mission, astronomers have been able to measure parallax with incredible precision. The Gaia mission, launched in 2013, aims to create a three-dimensional map of our galaxy by measuring the positions and distances of over a billion stars, utilizing the principles of stellar parallax on an unprecedented scale.Understanding stellar parallax not only enhances our knowledge of the universe but also helps us comprehend the vastness of space. The ability to measure distances to stars allows astronomers to study their properties, such as luminosity, temperature, and size, which are essential for understanding stellar evolution and the lifecycle of stars. Moreover, stellar parallax serves as a stepping stone for measuring even greater distances in the universe, as it provides a reliable baseline for calibrating other distance measurement techniques, such as the use of standard candles like Cepheid variables and Type Ia supernovae.In conclusion, stellar parallax is a fundamental concept in astronomy that has greatly advanced our understanding of the cosmos. By enabling astronomers to measure distances to nearby stars, it lays the groundwork for exploring the structure and dynamics of our galaxy and beyond. As technology continues to evolve, the importance of stellar parallax will only grow, allowing us to uncover more secrets of the universe and appreciate the beauty and complexity of the night sky. In summary, stellar parallax (恒星视差) is not just a technical term; it represents a gateway to understanding our place in the universe and the intricate dance of celestial bodies that surround us.

理解恒星视差这个概念对于任何对天文学和天文距离测量感兴趣的人来说都是至关重要的。恒星视差的定义是，当从地球轨道的不同位置观察一颗星星时，它相对于更远的星星的明显位置变化，这为确定附近恒星的距离提供了一种基本方法。这种现象的发生是因为当地球围绕太阳移动时，我们观察星星的角度会发生轻微变化，产生可以测量的视觉效果。要理解恒星视差的重要性，首先必须了解三角测量的基本原理。三角测量是一种在各个领域中使用的方法，包括导航和测绘，通过从已知点形成三角形来确定一个点的位置。在天文学的情况下，这两个点是地球在一年中不同时间的位置，通常相隔六个月。通过测量星星的明显位移角度，并知道基线距离（地球轨道的直径），天文学家可以使用简单的三角学计算出星星的距离。19世纪初，天文学家弗里德里希·贝塞尔成功测量了恒星视差，这是第一次成功测量。他测量了星星61 Cygni的视差。他的工作提供了第一个直接证据，表明星星并不是固定的光点，而是位于离地球不同距离的物体。这一开创性的发现打开了天体测量学的领域，该领域专注于测量天体的位置和运动。在现代天文学中，恒星视差仍然是一个重要工具，特别是在测量离地球几百光年内的星星的距离方面。随着技术的进步，如哈勃太空望远镜和盖亚任务等基于太空的望远镜，天文学家能够以令人难以置信的精度测量视差。盖亚任务于2013年发射，旨在通过测量超过十亿颗星星的位置和距离来创建我们银河系的三维地图，利用恒星视差的原理，在前所未有的规模上进行。理解恒星视差不仅增强了我们对宇宙的知识，还帮助我们理解空间的广阔。测量星星距离的能力使天文学家能够研究它们的性质，例如亮度、温度和大小，这些对于理解恒星演化和恒星生命周期至关重要。此外，恒星视差还作为测量宇宙中更大距离的跳板，因为它为校准其他距离测量技术（如使用标准烛光的造父变星和Ia型超新星）提供了可靠的基线。总之，恒星视差是天文学中的一个基本概念，它极大地推动了我们对宇宙的理解。通过使天文学家能够测量附近恒星的距离，它为探索我们银河系及更远的结构和动态奠定了基础。随着技术的不断发展，恒星视差的重要性只会增加，使我们能够揭示宇宙更多的秘密，欣赏夜空的美丽与复杂。总之，恒星视差（恒星视差）不仅仅是一个技术术语；它代表了理解我们在宇宙中的位置以及围绕我们的天体之间复杂舞蹈的门户。