absolute parallax

简明释义

绝对视差

英英释义

例句

1.By measuring the absolute parallax 绝对视差 of various stars, researchers can create a more accurate map of our galaxy.

通过测量各种恒星的绝对视差 absolute parallax，研究人员可以创建更准确的银河系地图。

2.The astronomers calculated the absolute parallax 绝对视差 of the nearby star to determine its distance from Earth.

天文学家计算了附近恒星的绝对视差 absolute parallax以确定其与地球的距离。

3.The concept of absolute parallax 绝对视差 helps in understanding the three-dimensional structure of the universe.

绝对视差 absolute parallax 的概念有助于理解宇宙的三维结构。

4.The absolute parallax 绝对视差 method is essential for determining the scale of the universe.

使用绝对视差 absolute parallax 方法对于确定宇宙的尺度至关重要。

5.Astronomers use telescopes to measure the absolute parallax 绝对视差 of distant celestial objects.

天文学家使用望远镜测量遥远天体的绝对视差 absolute parallax。

作文

The concept of absolute parallax plays a crucial role in the field of astronomy and astrophysics. To understand what absolute parallax is, we first need to grasp the idea of parallax itself. Parallax refers to the apparent shift in position of an object when viewed from different angles. This phenomenon can be easily observed with our own eyes; for instance, if you hold your finger in front of your face and look at it with one eye closed, then switch eyes, your finger appears to move against the background. This shift is due to the change in viewpoint, and it is this principle that astronomers utilize to measure distances to stars and other celestial objects.Now, when we talk about absolute parallax, we are specifically referring to the measurement of a star's distance from Earth in terms of parsecs, based on its parallax angle. The parallax angle is defined as the angle subtended at the star by the radius of Earth's orbit around the Sun. This angle is incredibly small, which is why measuring absolute parallax requires precise instruments and techniques. The formula for calculating the distance to a star using absolute parallax is relatively straightforward: the distance in parsecs is equal to one divided by the parallax angle measured in arcseconds. For example, if a star has a parallax angle of 0.1 arcseconds, its distance from Earth would be 10 parsecs.Understanding absolute parallax is essential for astronomers because it allows them to determine the scale of the universe. Before the advent of modern technology, astronomers relied on less accurate methods to estimate distances to stars, which often led to significant errors in their calculations. With the ability to measure absolute parallax, scientists can now create more accurate models of the Milky Way and beyond.Furthermore, absolute parallax is also fundamental in the study of stellar evolution and the characteristics of stars. By knowing the distance to a star, astronomers can calculate its luminosity, temperature, and size, which are vital for understanding the life cycle of stars. For instance, a star’s brightness as seen from Earth can be misleading since it depends on both its intrinsic luminosity and its distance from us. By applying absolute parallax, astronomers can distinguish between these factors and gain insights into the nature of the star.In addition to its applications in astronomy, absolute parallax also serves as a reminder of the vastness of our universe. The distances involved are so immense that they challenge our everyday understanding of space and time. For example, the nearest star system, Alpha Centauri, is about 4.37 light-years away, which translates to a parallax angle of only about 0.75 arcseconds. Such figures illustrate just how far away these celestial bodies are, and they emphasize the importance of precise measurements in expanding our knowledge of the cosmos.In conclusion, absolute parallax is not just a technical term; it represents a fundamental method through which we can explore and understand the universe. Its significance extends beyond mere calculations, as it opens up pathways to comprehend the vast distances and intricate processes that govern the stars. By mastering the concept of absolute parallax, we not only enhance our scientific knowledge but also foster a deeper appreciation for the majestic universe we inhabit.

“绝对视差”这一概念在天文学和天体物理学领域中发挥着至关重要的作用。要理解“绝对视差”的含义，我们首先需要掌握视差本身的概念。视差是指从不同角度观察物体时，物体位置的明显变化。这一现象可以通过我们自己的眼睛轻松观察到；例如，如果你把手指放在脸前，然后闭上一只眼睛看它，再换眼睛，你的手指在背景中似乎会移动。这种偏移是由于视角的变化，而正是这一原理被天文学家用来测量恒星和其他天体的距离。现在，当我们谈论“绝对视差”时，我们特别指的是根据恒星的视差角度，以秒差距为单位测量恒星与地球之间的距离。视差角度被定义为恒星与地球之间的距离与地球围绕太阳轨道半径所形成的角度。这个角度非常小，这就是为什么测量“绝对视差”需要精确的仪器和技术。计算恒星距离的公式相对简单：距离（以秒差距为单位）等于1除以以弧秒为单位测得的视差角度。例如，如果一颗恒星的视差角为0.1弧秒，则其与地球的距离为10秒差距。理解“绝对视差”对天文学家来说至关重要，因为它使他们能够确定宇宙的规模。在现代技术出现之前，天文学家依赖于不太准确的方法来估算恒星的距离，这常常导致他们的计算出现重大误差。随着能够测量“绝对视差”，科学家们现在可以创建更精确的银河系及其以外的模型。此外，“绝对视差”在恒星演化和恒星特性研究中也具有基础性作用。通过了解恒星的距离，天文学家可以计算其光度、温度和大小，这些对于理解恒星的生命周期至关重要。例如，恒星在地球上看到的亮度可能会产生误导，因为它既取决于恒星的内在光度，也取决于它与我们的距离。通过应用“绝对视差”，天文学家可以区分这些因素，并深入了解恒星的本质。除了在天文学中的应用外，“绝对视差”还提醒我们宇宙的浩瀚。涉及的距离是如此巨大，以至于挑战了我们对空间和时间的日常理解。例如，离我们最近的恒星系统——阿尔法·半人马星系，距离约为4.37光年，这相当于约0.75弧秒的视差角。这些数字说明了这些天体是多么遥远，并强调了精确测量在扩展我们对宇宙知识的重要性。总之，“绝对视差”不仅仅是一个技术术语；它代表了一种基本方法，通过这种方法我们可以探索和理解宇宙。它的重要性超越了简单的计算，因为它为我们理解主宰恒星的巨大距离和复杂过程打开了通道。通过掌握“绝对视差”的概念，我们不仅增强了科学知识，还培养了对我们所居住的宏伟宇宙的更深刻欣赏。