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。
Orbit of the Earth can be considered to be circular.
地球轨道可认为是圆形的。
Chaotic attitude motion of a magnetic rigid spacecraft in a circular orbit of the earth is treated.
研究在地球万有引力场和磁场中的磁性刚体航天器在圆轨道上的混沌姿态运动。
The minor planet moves around the Sun in the ecliptic plane, never coming inside the orbit of the Earth.
小某行星在黄道平面内绕着太阳运行，从不进入地球轨道以内。
The author investigates the secular influence of solar mass-loss on the change of the orbit of the earth.
研究了太阳质量损失对地球轨道改变的长期影响。
They were started by slow and subtle shifts in the orbit of the Earth that changed the amount and distribution of radiation reaching us from the sun.
地球轨道缓慢而微弱的变化改变了阳光照射我们的数量和辐射的分布，从而引发了这些变化。
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。
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）。
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。
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。
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。
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.
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。
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。
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。
This altered the propagation of GPS signals and slowed the rate of decay of space debris in low Earth orbit.
这样就改变了GPS信号的传播，减小了地球底层轨道上空间碎块的衰减速度。
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。
The velocity of the Earth in orbit is about 30 kilometers per second.
地球在轨道里的速度，约为30千米每秒。
Orbit of the Moon, and we see the Earth.
月球的轨道，以及我们看到的地球。
And out of this information you get the radius, the velocity and the period, assuming that you are on Earth in the plane of the orbit of the stars.
除了这个，还能得到半径的大小，速度以及周期，假设你在地球上，和这些恒星环绕的，轨道同处一个平面。
Six years of observations revealed the presence of five planets between 13 and 25 times the mass of Earth, or about the mass of Neptune, that orbit the parent star once every 6 to 600 days.
经过长达六年的观察，科学家发现有五颗行星的质量是地球的13-25倍，或者说，与海王星的质量差不多，它们围绕恒星的旋转周期在6到600天之间。
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。
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。
The space station is in no danger of entering the main debris clouds because it is orbiting just 220 miles above Earth, or 271 miles below the orbit of the collision.
由于国际空间站距离地面只有220英里，且位于卫星相撞轨道下方271英里处，因此主碎片云进入国际空间站的机率很小。
The earth is one of mine planets which move in orbit round the sun.
地球是沿轨道围绕太阳运行的九大行星之一。
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。
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。
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。
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。
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