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。
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。
But why does then the moon orbit the earth?
那么为什么月亮绕着地球转呢？
Once the Soyuz began to orbit the Earth, the failures began.
当联盟号开始环绕地球的时候，失败随之降临了。
Shenzhou Seven will orbit the Earth at an altitude of 343 kilometers.
神七在343公里高空的轨道绕地球飞行。
On February 20, 1962, Glenn became the first American to orbit the Earth.
1962年2月20日，格伦成为首位进入地球轨道的美国人。
The orbital module will continue to orbit the earth and carry out more experiments until its battery runs out.
卫星留轨舱在电池耗尽之前，还将在轨运行一段时间，继续进行一些科学实验任务。
Friendship 7, he became the first American to orbit the earth. He was elected U. S. senator from Ohio in 974, 980, and 98 '.
友谊7号航天飞船进行轨道飞行，成为第一个绕地球轨道飞行的美国人。他先后于974年、980年和98 '年当选为俄亥俄州的参议员。
Traveling at 17, 500 miles per hour (5 miles per second)…we orbit the Earth every 90 minutes, with a sunrise or sunset every 45 minutes.
以时速17500英里/小时（5英里/秒）飞行，每90分钟我们就绕地球飞行一圈，就是说每45分钟就日升或日落一次。
Pressel says that even 40 years after its original launch, Hexagon is still one of the most complicated vehicles ever to orbit the earth because it used film.
Pressel说甚至在它发射四十年后，Hexagon仍然是地球轨道上最复杂的卫星之一，因为它使用胶卷。
These devices are used in satellites that orbit the Earth within the Van Allen radiation Belts and must be able to work in a continuous low-radiation environment.
这些装置用于在“范·艾伦辐射带”内沿一定轨道绕地球运行的卫星上，它们必须能在持续低辐射的环境中正常工作。
Chosen for the US astronaut programme in 1958, Jerrie Cobb had twice as many flight hours to her name as John Glenn, who became the first American to orbit the earth.
JerrieCobb在1958年被选入美国航天员计划，她的飞行时间是美国第一个环绕地球的人JohnGlenn的两倍。
The TV report said the Rasad satellite, developed by Iran's aerospace agency, weighs 15.3kg and has been designed to orbit the Earth 15 times a day at a height of 160 miles.
电视报道说“拉萨德”卫星，由伊朗航空航天局研发，重15.3公斤，每天在160公里的高空绕地球15次
OCO will similarly study carbon dioxide and also oxygen signatures in reflected sunlight. It will fly at an average altitude of 705km and orbit the Earth about every 99 minutes.
同样，OCO也会研究太阳反射光线中的二氧化碳和氧气特征光谱，它将于705公里的上空以99分钟绕地球一圈的速度飞行。
Many, though, form a ring like Saturn's at a distance of 36,000km, the place at which an object takes 24 hours to orbit the Earth and thus hovers continuously over the same point of the planet.
尽管，许多卫星在36000千米处形成一个类似土星光环的环，但这个高度的卫星都需要花费24小时绕地球一圈。因此，它们一直在地球上空的同一点盘旋。
The announcement in Florida came on the 30th anniversary of the first space shuttle flight and on the 50th anniversary of Soviet cosmonaut Yuri Gagarin becoming the first human to orbit the earth.
最后结果在佛罗里达州宣布，日期是第一次航天飞机飞行30周年以及苏联宇航员尤里·加加林成为绕地球轨道飞行第一人50周年纪念日。
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 earth takes a year to orbit the sun.
地球绕太阳一周要一年的时间。
A new satellite has been put into orbit around the earth.
一颗新的人造卫星被送上了环绕地球的轨道。
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。
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。
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。
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。
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。
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。
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