You see how this epicycle theory could account for the seemingly backward motion of the planet.
你可以看到这个本轮理论是如何解释行星看起来像在做反向运动的。
Motion during the long exposure produced streaks in the starry background and the city lights on the darkened planet below.
在长时间曝光中的运动在星光熠熠的背景和下方变暗了的城市灯光上产生了条纹。
On August 6th America’s space agency, NASA, announced that its Kepler planet-detector (named after the man who worked out the laws of planetary motion, as this article explains) is also behaving well.
8月6日，美国航天局和美国宇航局（NASA），宣称其开普勒号行星探测仪（根据发现了行星移动定律的开普勒命名，点此可见详细介绍）现在运行得十分良好。
Long long ago, we knew the periodic motion of a planet.
很久以前，我们就知道行星的周期运动。
There are two main research fields in the rotation dynamics of the planet Earth: rotation variation and the fluid motion effected by rotation.
行星地球自转动力学主要有两方面研究内容：自转变化和在自转条件下内部流体物质运动。
The very forces that were set in motion when the planet was created are the same forces that eventually will spell its demise.
星球创造之初的原动力正是其最终走向终结之因。
The very forces that were set in motion when the planet was created are the same forces that eventually will spell its demise.
星球创造之初的原动力正是其最终走向终结之因。
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