standard candle

简明释义

标准烛光

英英释义

例句

1.In physics, a standard candle (标准烛光) is an object with a known luminosity used for measuring astronomical distances.

在物理学中，标准烛光（标准烛光）是一个具有已知光度的物体，用于测量天文距离。

2.Using a standard candle (标准烛光) allows astronomers to calculate the expansion rate of the universe.

使用标准烛光（标准烛光）可以让天文学家计算宇宙的膨胀速度。

3.Astronomers often use a type of star known as a standard candle (标准烛光) to measure distances in the universe.

天文学家常常使用一种被称为标准烛光（标准烛光）的恒星来测量宇宙中的距离。

4.The brightness of a standard candle (标准烛光) helps scientists determine how far away galaxies are from Earth.

一个标准烛光（标准烛光）的亮度帮助科学家确定银河系离地球有多远。

5.Type Ia supernovae are considered reliable standard candles (标准烛光) for measuring cosmic distances.

Ia型超新星被认为是测量宇宙距离的可靠标准烛光（标准烛光）。

作文

In the realm of astronomy, the term standard candle refers to a type of astronomical object that has a known luminosity. This concept is crucial for measuring distances in the universe. By comparing the intrinsic brightness of a standard candle with its observed brightness from Earth, astronomers can determine how far away the object is. One of the most common examples of a standard candle is a type of supernova known as Type Ia supernovae. These stellar explosions occur in binary systems where one star siphons material from its companion until it reaches a critical mass and explodes. Because these explosions have a consistent peak brightness, they serve as reliable indicators for distance measurements across vast cosmic scales.Understanding the significance of standard candles extends beyond mere distance measurement; it also plays a vital role in our comprehension of the universe's expansion. The use of standard candles allows scientists to map out the rate at which the universe is expanding, leading to groundbreaking discoveries such as the acceleration of this expansion, attributed to dark energy.In addition to Type Ia supernovae, other celestial objects can also serve as standard candles. For instance, Cepheid variable stars are another category of standard candle. These stars pulsate at regular intervals, and their luminosity is directly related to their pulsation period. By observing the period of a Cepheid variable star, astronomers can ascertain its true brightness and, by extension, calculate its distance from Earth.The concept of standard candles highlights the importance of having reliable benchmarks in astronomical measurements. Without such tools, determining the scale of the universe would be nearly impossible. The ability to measure distances accurately allows astronomers to construct a three-dimensional map of the cosmos, revealing the distribution of galaxies and other celestial structures.Moreover, the implications of using standard candles reach into cosmology and the study of the universe's fate. By understanding how fast the universe is expanding, scientists can make predictions about its ultimate destiny. Will it continue to expand forever, or will gravitational forces eventually pull everything back together? The answers to these questions hinge on precise measurements facilitated by standard candles.In conclusion, the term standard candle encapsulates a fundamental concept in astronomy that enables researchers to measure cosmic distances and understand the universe's behavior. From Type Ia supernovae to Cepheid variable stars, these celestial markers provide a means to navigate the vastness of space. As we continue to refine our methods and discover new standard candles, our grasp of the universe will only deepen, leading to more profound insights into the nature of reality itself.

在天文学领域，术语标准烛光指的是一种具有已知光度的天文物体。这个概念对于测量宇宙中的距离至关重要。通过比较标准烛光的内在亮度与其从地球观察到的亮度，天文学家可以确定物体的远近。最常见的标准烛光示例是一种称为Ia型超新星的超新星。这些恒星爆炸发生在双星系统中，其中一颗恒星从其伴星吸取物质，直到达到临界质量并爆炸。由于这些爆炸具有一致的峰值亮度，它们作为跨越广阔宇宙尺度的距离测量的可靠指标。理解标准烛光的重要性不仅仅限于距离测量；它还在我们对宇宙扩张的理解中发挥着重要作用。使用标准烛光使科学家能够绘制出宇宙扩张速度的图谱，导致了诸如这种扩张加速的突破性发现，这归因于暗能量。除了Ia型超新星，其他天体也可以作为标准烛光。例如，造父变星是另一类标准烛光。这些恒星以规则的间隔脉动，其光度与脉动周期直接相关。通过观察造父变星的周期，天文学家可以确定其真实亮度，从而计算出其与地球的距离。标准烛光的概念突显了在天文测量中拥有可靠基准的重要性。如果没有这样的工具，准确确定宇宙的规模几乎是不可能的。精确测量距离的能力使天文学家能够构建宇宙的三维地图，揭示星系和其他天体结构的分布。此外，使用标准烛光的意义还延伸到宇宙学和对宇宙命运的研究。通过了解宇宙扩张的速度，科学家可以对其最终命运做出预测。这将永远扩展，还是引力最终会将一切拉回一起？这些问题的答案依赖于通过标准烛光促进的精确测量。总之，术语标准烛光概括了天文学中的一个基本概念，使研究人员能够测量宇宙距离并理解宇宙的行为。从Ia型超新星到造父变星，这些天体标记提供了一种导航广袤空间的手段。随着我们继续改进方法并发现新的标准烛光，我们对宇宙的理解将不断加深，从而带来对现实本质的更深刻洞察。