planetary orbit

简明释义

行星轨道

英英释义

例句

1.The planetary orbit 行星轨道 of Earth is approximately 365 days long.

地球的行星轨道大约长达365天。

2.Scientists study the planetary orbit 行星轨道 of exoplanets to understand their atmospheres.

科学家研究系外行星的行星轨道以了解它们的大气层。

3.The spacecraft was designed to enter a stable planetary orbit 行星轨道 around Mars.

这艘航天器被设计为进入火星的稳定行星轨道。

4.Astronomers can predict the planetary orbit 行星轨道 of comets for future observations.

天文学家可以预测彗星的行星轨道以便进行未来的观测。

5.The stability of a planetary orbit 行星轨道 is crucial for the development of life.

一个行星轨道的稳定性对生命的发展至关重要。

作文

The concept of planetary orbit refers to the path that a planet takes as it revolves around a star, such as our Sun. This phenomenon is governed by the laws of physics, particularly Newton's law of universal gravitation and Kepler's laws of planetary motion. Understanding planetary orbit is crucial for various fields, including astronomy, physics, and space exploration. To begin with, the shape of a planetary orbit is typically elliptical, meaning that it resembles an elongated circle. This was first described by Johannes Kepler in the early 17th century. According to Kepler's first law, known as the law of ellipses, every planet moves in an elliptical orbit with the Sun at one of its two foci. This means that the distance between a planet and the Sun varies throughout its orbit, leading to changes in the planet's speed. When a planet is closer to the Sun, it moves faster; when it is farther away, it moves slower. This variation in speed is a fundamental aspect of planetary orbit dynamics.Moreover, the gravitational forces at play also influence the stability and characteristics of a planetary orbit. The gravitational pull from the Sun keeps the planets in their respective orbits, preventing them from drifting away into space. This delicate balance between the forward motion of the planets and the gravitational pull of the Sun creates a stable environment for the solar system. Without this balance, the planets could potentially collide or be ejected from the solar system altogether.Additionally, the study of planetary orbit has practical implications for space missions. For instance, when planning a mission to another planet, scientists must calculate the trajectory that the spacecraft will take based on the planetary orbit of both the Earth and the target planet. This involves complex calculations to ensure that the spacecraft arrives at the right time and place in relation to the moving planets. Such precision is vital for successful missions, such as those undertaken by NASA and other space agencies.Furthermore, understanding planetary orbit is essential when considering exoplanets, which are planets outside our solar system. Astronomers use similar principles to detect and study these distant worlds. By observing the light from stars and noting any periodic dimming, scientists can infer the presence of a planetary orbit around that star. This has led to the discovery of thousands of exoplanets, expanding our understanding of the universe and the potential for life beyond Earth.In conclusion, the term planetary orbit encompasses a wide range of scientific concepts and principles. From the elliptical paths that planets take around stars to the gravitational forces that maintain these orbits, understanding planetary orbit is crucial for both theoretical and practical applications in science. As we continue to explore our universe, the knowledge of planetary orbit will remain a cornerstone of our understanding of celestial mechanics and the dynamics of our solar system and beyond.

“行星轨道”这一概念指的是行星围绕恒星（例如我们的太阳）旋转时所经过的路径。这一现象受物理学法则的支配，特别是牛顿的万有引力定律和开普勒的行星运动定律。理解“行星轨道”对于天文学、物理学和太空探索等多个领域至关重要。首先，“行星轨道”的形状通常是椭圆的，这意味着它看起来像一个拉长的圆。这一点最早是在17世纪初由约翰内斯·开普勒描述的。根据开普勒的第一定律，即椭圆定律，每个行星都以椭圆轨道运动，太阳位于其两个焦点之一。这意味着行星与太阳之间的距离在其轨道上是变化的，从而导致行星速度的变化。当行星靠近太阳时，它的运动速度较快；而当它远离太阳时，速度则较慢。这种速度的变化是“行星轨道”动力学的基本特征。此外，影响“行星轨道”的重力也对轨道的稳定性和特性起着作用。太阳的引力使行星保持在各自的轨道上，防止它们漂离太空。如果没有这种平衡，行星可能会发生碰撞或被整个太阳系排斥出去。此外，研究“行星轨道”对太空任务也有实际意义。例如，在计划前往另一颗行星的任务时，科学家必须根据地球和目标行星的“行星轨道”计算航天器的轨迹。这涉及复杂的计算，以确保航天器在与移动行星相关的正确时间和地点到达。这样的精确性对于成功的任务至关重要，例如美国宇航局和其他太空机构开展的任务。此外，理解“行星轨道”在考虑系外行星时也是必不可少的，系外行星是指我们太阳系之外的行星。天文学家使用类似的原理来探测和研究这些遥远的世界。通过观察星星的光线并注意任何周期性的暗淡，科学家可以推断出该星星周围存在“行星轨道”。这导致了数千颗系外行星的发现，扩展了我们对宇宙的理解以及地球以外生命的潜力。总之，“行星轨道”一词涵盖了广泛的科学概念和原则。从行星围绕恒星的椭圆路径到维持这些轨道的引力，理解“行星轨道”对于科学的理论和实践应用都至关重要。随着我们继续探索宇宙，对“行星轨道”的知识将始终是我们理解天体力学以及太阳系及其之外动态的基石。