The two spacecraft will link up in orbit.
两艘宇宙飞船将在轨道上对接。
The orbit of this comet intersects the orbit of the Earth.
这颗彗星的轨道和地球的轨道相交。
The orientation of the planet's orbit is changing continuously.
该行星轨道的方向不断变化。
Astronauts will make a final attempt today to rescue a communications satellite from its useless orbit.
宇航员们今天将做最后一次尝试，把一颗通讯卫星从它无用的轨道上拯救出来。
This kind of periodic orbit is only a phase in a comet's life.
这种周期性轨道只是彗星生命中的一个阶段。
Periodic changes in Earth's orbit could affect Earth's climate.
地球轨道的周期性变化会影响地球的气候。
Once, we saw it was moving in a pattern consistent with an orbit.
有一次，我们看到它以与轨道一致的方式移动。
When we finish, ISS will be a premier, world-class laboratory in low Earth orbit.
当我们完成时，国际空间站将成为近地轨道上一流的世界级实验室。
Its orbit brought it relatively close to the Earth, within 122 million miles of it.
它的轨道将它带到了距离地球1.22亿英里之内，距离地球相当之近。
Changes in the eccentricity of Earth's orbit occur in a cycle of about 96,000 years.
地球轨道偏心率的变化大约在96000年的一个周期内发生。
The earth's gravity slows the moon's rotation, matching it to the speed of its orbit.
地球引力减缓了月球的自转速度，使之与其轨道的速度相匹配。
Unlike earlier lunar missions, Clementine didn't orbit only around the moon's equator.
不像早些时候的月球探测那样，克莱门飞船并不是仅仅沿着月球的轨道飞行。
Within each orbit, collisions between planetesimals generated immense heat and energy.
在每个轨道内，天体之间的碰撞产生了巨大的热量和能量。
With nine engines on the first stage, Falcon 9 can reach orbit even if one or more fails.
猎鹰9号的第一级有9个引擎，即使一个或多个引擎故障，它仍然可以到达预定轨道。
Knowing the width of Earth's orbit, the parallax shift lets astronomers calculate the distance.
知道了地球轨道的宽度，视差偏移可以让天文学家计算距离。
Astronomers have detected an asteroid not far from Earth, moving in the same orbit around the Sun.
天文学家在距离地球不远处发现一颗小行星，它与地球在同一轨道上围绕太阳运行。
When Earth's orbit is more elliptical, Earth is actually closer to the sun during part of the year.
当地球的轨道更接近椭圆时，地球实际上在一年的一部分时间里更接近太阳。
As the cost of getting your own satellite in orbit drops sharply, the risks of irresponsible use grow.
随着将自己的卫星送入轨道的成本大幅下降，不负责任使用卫星的风险也随之增加。
Just half a dozen holiday-makers have reached orbit since then, for similarly astronomical price tags.
从那之后，只有6个度假者到达了太空轨道，价格也同样是天文数字。
Having your personal satellite launched into orbit might sound like an idea straight out of science fiction.
把你的个人卫星发射到轨道上，可能听起来像是科幻小说里的情节。
One characteristic of Earth's orbit is its eccentricity, the degree to which the orbit is an ellipse rather than a circle.
地球轨道的一个特点是它的离心率，也就是轨道是椭圆而不是圆形的程度。
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