perihelion distance

简明释义

近日点距离

英英释义

例句

1.The perihelion distance of an asteroid can indicate its potential risk to Earth.

小行星的近日点距离可以指示其对地球的潜在风险。

2.Understanding the perihelion distance helps in planning space missions to other planets.

理解近日点距离有助于规划前往其他行星的太空任务。

3.The perihelion distance of Mercury is shorter than that of Venus, affecting its orbital characteristics.

水星的近日点距离比金星短，这影响了它的轨道特性。

4.Astronomers calculate the perihelion distance to understand the orbits of celestial bodies.

天文学家计算近日点距离以理解天体的轨道。

5.The comet's perihelion distance is crucial for predicting its brightness as it approaches the sun.

彗星的近日点距离对于预测它接近太阳时的亮度至关重要。

作文

The concept of perihelion distance refers to the closest point of an orbiting body to the Sun. In astronomy, understanding the perihelion distance is crucial for studying the orbits of planets, comets, and other celestial objects. When a celestial body approaches the Sun, it experiences increased gravitational forces, which can significantly affect its velocity and trajectory. For instance, when comets near their perihelion distance, they often display spectacular tails as the heat from the Sun causes the ice and dust within them to vaporize. To illustrate this further, let’s consider the famous comet Halley. Halley's Comet has a highly elliptical orbit, which brings it close to the Sun approximately every 76 years. During its last perihelion passage in 1986, the comet reached a perihelion distance of about 0.09 astronomical units (AU) from the Sun, which is roughly 8.5 million kilometers. This proximity to the Sun allowed astronomers to study the comet in detail, revealing much about its composition and behavior. The perihelion distance is not only significant for comets but also for planets. For example, Earth’s perihelion distance occurs around January 3rd each year, when it is about 147 million kilometers from the Sun. This distance plays a role in seasonal variations and climate patterns on our planet. Interestingly, the perihelion distance can vary slightly due to gravitational interactions with other bodies in the solar system, leading to long-term changes in Earth's orbit known as Milankovitch cycles. Understanding the perihelion distance also has implications for space missions. When planning missions to other planets or asteroids, scientists must take into account the perihelion distance to optimize fuel usage and timing. For instance, when NASA's Parker Solar Probe was launched, its trajectory was carefully calculated to utilize the perihelion distance of Venus to gain speed and adjust its path toward the Sun. In conclusion, the term perihelion distance represents a fundamental aspect of celestial mechanics that influences the behavior of various astronomical bodies. By studying the perihelion distance, astronomers can gain insights into the dynamics of our solar system, improve our understanding of climate patterns on Earth, and enhance the planning of space missions. As we continue to explore the universe, the significance of perihelion distance will undoubtedly remain a key topic of interest and research in the field of astronomy.

“perihelion distance”的概念指的是轨道物体与太阳之间的最接近点。在天文学中，理解perihelion distance对于研究行星、彗星和其他天体的轨道至关重要。当一个天体靠近太阳时，它会经历增强的引力，这可能显著影响其速度和轨迹。例如，当彗星接近它的perihelion distance时，通常会显示出壮观的尾巴，因为来自太阳的热量使其内部的冰和尘埃蒸发。为了进一步说明这一点，让我们考虑著名的哈雷彗星。哈雷彗星的轨道是高度椭圆形的，每76年左右就会靠近太阳一次。在1986年的最后一次近日点经过时，该彗星达到了大约0.09天文单位（AU）的perihelion distance，即大约850万公里。这种接近太阳的距离使天文学家能够详细研究该彗星，揭示了许多关于其成分和行为的信息。perihelion distance不仅对彗星重要，对行星也是如此。例如，地球的perihelion distance发生在每年的1月3日，此时距离太阳约为1.47亿公里。这一距离在季节变化和气候模式中起着作用。有趣的是，由于与太阳系中其他天体的引力相互作用，perihelion distance可能会略微变化，导致地球轨道的长期变化被称为米兰科维奇周期。理解perihelion distance也对太空任务有影响。在计划前往其他行星或小行星的任务时，科学家必须考虑perihelion distance以优化燃料使用和时机。例如，当NASA的帕克太阳探测器发射时，其轨迹经过仔细计算，以利用金星的perihelion distance来获得速度并调整其朝向太阳的路径。总之，术语perihelion distance代表了天体力学的一个基本方面，影响着各种天文物体的行为。通过研究perihelion distance，天文学家可以深入了解我们太阳系的动态，改善对地球气候模式的理解，并增强太空任务的规划。随着我们继续探索宇宙，perihelion distance的重要性无疑将继续成为天文学领域关注和研究的关键主题。