It is long known that Earth's orbit around the Sun changes periodically, cyclically affecting the way solar radiation strikes the Earth.
人们早就知道，地球围绕太阳的轨道会周期性地变化，周期性地影响太阳辐射照射地球的方式。
The mirrors could orbit—thousands of miles high—at the same speed as the earth turns on its axis.
这些镜子可以在几千英里的高空以地球绕地轴旋转的速度运行。
Earth is the only one of the inner planets with a large satellite, the orbit of which is neither in the equatorial plane of Earth nor in the plane in which the other planets lie.
地球是内行星中唯一一个有大卫星的，它的轨道既不在地球的赤道平面上，也不在其他行星所在的平面上。
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。
It says that variations in earth's movements, specifically in its orbit around the sun, these variations lead to differences in the amount of solar energy that reaches the earth.
这一假设认为，地球运行的变化，特别是绕太阳轨道的变化，会导致太阳到达地球能量的不同。
The greatest concern the authors raise is space debris-pieces of "junk" that orbit the earth, with the potential to cause serious damage if they collide with operational units, including the ISS.
两位作者提出的最大担忧是太空垃圾——环绕地球运行的“垃圾”碎片，如果它们与包括国际空间站在内的运行单位相撞，可能会造成严重损害。
Once you are in this geostationary orbit right over the tower, just lower your carbon nanotube cable down from the satellite, tether it to the tower here on Earth.
一旦你来到这个塔旁的地球静止轨道，只需把碳纳米管电缆从卫星上放低然后将其系在位于地球的塔端。
The greatest concern the authors raise is space debris—pieces of "junk" that orbit the earth, with the potential to cause serious damage if they collide with operational units, including the ISS.
作者提出的最大担忧是太空碎片，即环绕地球的“垃圾”碎片，如果它们与包括国际空间站在内的运行体相撞，将有可能造成严重损害。
As it lost weight, it started to incline its orbit toward the earth: it was dangerous, above and beyond anything else.
当它失重的时候，它开始将它的轨道向地球倾斜：这是危险的，比其他任何东西都危险。
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。
Because the moon's body blocks direct radio communication with a probe, China first had to put a satellite in orbit above the moon in a spot where it could send signals to the spacecraft and to Earth.
由于月球阻碍了与探测器的直接无线电通信，中国首先必须把一颗人造卫星送入月球轨道上的一个点，人造卫星可以从那里向航天器和地球发射信号。
The satellites sit in a very special orbit that allows them to circle the Earth once in 24 hours.
这些卫星位于一个十分特殊的轨道，以便它们能每隔24小时环绕地球一周。
The central idea behind a Space Elevator involves lowering a cable — perhaps constructed from asteroid material — from geostationary Earth orbit to the surface of the Earth.
太空升降机背后的核心理念包括降下一根电缆——也许是由小行星材料制成的，——从对地静止轨道到地球表面。
This fact did not prevent the making of the 1961 film "the Day the Earth Caught Fire," in which nuclear testing knocks the Earth out of its orbit and towards the sun.
可是这个事实并不能阻挡1961年电影《地球起火的那一天》的拍摄，在这部电影里核试验把地球冲出它的运行轨道而走向太阳。
To learn more about how the sun and other stars work, after early observations using rockets, scientists began studying the sun from Earth orbit.
为了探索太阳和其它恒星的工作原理，在早期观测活动后，科学家使用火箭开始在地球轨道上对太阳进行研究。
"The asteroids in the most Earth-like orbit are the ones that threaten us most, but they're also the ones that are easiest to get to," Yeomans says.
约曼斯说：“在那些小行星中，与地球轨道最接近的，对我们的威胁也最大，但是他们也是我们最容易登陆的星球。”
It follows that the Moon's orbit is primarily determined by the gravitation pull from the Sun, so the orbit of the Earth will always curve towards the Sun.
由此断定月球的轨道主要由来自太阳的牵引力决定，所以地球对于太阳的轨道一直是椭圆形的。
Indeed, who would refuse a chance to rise up to the stars and have a look at our Planet Earth from the orbit?
的确，谁又会拒绝这样一次升上星空，从轨道俯瞰我们地球的机会呢？
The orbit of the earth around the sun is eccentric because the orbit is slightly elliptical and so has effectively has two centres (neither of them the centre of the sun).
地球环绕太阳的公转轨道是偏心的，这是因为地球的公转轨道稍微呈椭圆形，所以这个轨道实际上就有两个中心（这两个中心都不与太阳的中心重合）。
Let's take the Earth going around the sun, and let's approximate the orbit by a circle.
假设地球绕这太阳转，的轨道是个圆圈。
This is because of the Moon's orbit around Earth which is oval or elliptical in shape.
这是因为月球环绕地球的轨道是卵形的或者椭圆形的。
This orbit (a high Earth or geosynchronous orbit) means that the satellite will always be directly over the same point on Earth, ensuring a continuous view of the ground.
这条轨道(高地同步轨道)意味着这些卫星总是位于地球上的某点之上，保证对地的持续观察。
If the equivalence principle were violated, the moon's orbit around the Earth would appear skewed, either towards or away from the sun.
如果等效原理遭到违背，月球围绕地球公转的轨道将会出现偏斜——靠近或是远离了太阳。
Your eyes are simulating the position of the Earth at the extremes of its orbit and your finger, the nearby star.
现在你的眼睛就是在模拟地球处在它轨道的两极而且你的手指就是临近的恒星。
This happens about once or twice a year, on the average, but not each month since the Moon's orbit around the Earth is slightly tilted.
这种情况每年平均发生一两次，不是每月都发生，因为月球绕地球公转的轨道稍稍有点斜。
The MIT-based authors of the journal article note that the trend could exacerbate some problems, such as the growing congestion in earth orbit as well as the danger of spreading space debris.
一个麻省理工的研究者写文章指出这种趋势加重了一些问题，如日趋严重的地球轨道堵塞和正在增加的空间垃圾。
The MIT-based authors of the journal article note that the trend could exacerbate some problems, such as the growing congestion in earth orbit as well as the danger of spreading space debris.
一个麻省理工的研究者写文章指出这种趋势加重了一些问题，如日趋严重的地球轨道堵塞和正在增加的空间垃圾。
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