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。
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。
That is, the amount of debris... Currently in orbit has reached a threshold where it will continually collide with itself, further increasing the population of orbital debris.
这就是说，现在在轨道上的残骸的数量已经到达了一个数值，然后它们就会慢慢开始自己相互碰撞，这样就会产生新的碎片。
At the worst, these will amount to twenty hours-the time it takes a radio signal to span the orbit of Pluto, the outer-most planet.
最糟糕的情况也就是20小时，即无线电信号越过最远的冥王星的轨迹的时间。
So to go around this circular orbit will take the same amount of time as to go around this one, and that is by no means obvious.
沿着圆形轨道运行的，时间和沿着椭圆轨道，所花费的时间是一样的，这决非显而易见的。
"Those two single events doubled the amount of fragments in Earth orbit and completely wiped out what we had done in the last 25 years," said Donald Kessler, who led the research.
“单单这两起事件就将在地球轨道上碎片的数量增加了一倍，并彻底抹煞了我们在过去25年所做的全部工作，”研究带头人凯斯勒·唐纳德说。
Stars are so much brighter than the planets which orbit them that their light overwhelms the small amount reflected from a planet's surface.
恒星比以他们为轨道运行的行星亮得多。他们的光盖过了从行星表面上反射过来的少量光。
Whether the interception mission successfully completed is depended on the amount of fuel consumption in the interception process, thus orbit optimization and control is of great significance.
拦截过程燃料消耗的多少很大程度上决定了拦截任务是否能够圆满完成，因此拦截轨道的优化和控制具有重要的意义。
This method is very powerful especially for problems concerning space debris mitigation that require a large amount of calculation of the satellite orbit lifetime.
在诸如空间碎片减缓这种需要非常大量的计算卫星寿命的问题中，新方法的价值得到充分体现。
If you have a huge rocket engine but a tiny amount of fuel, you probably won't make it to orbit.
如果你有一台巨大的火箭引擎但燃料较少，你可能无法让火箭进入轨道。
But gravity never disappears completely. An astronaut in orbit feels weightless, or zero gravity. (2) But a tiny amount of gravity is keeping his ship in orbit.
但是，引力绝不会全然消失。在轨道中飞行的宇航员，有失重的感觉，或失重状态的感觉。但是，微小的引力使他的飞船保持在轨道里。
He decided that the strength of the force keeping a planet in orbit around the sun depended on two things. One was the amount of mass in the planet and the sun. The other was how far apart they were.
他认为，让一颗行星在其轨道上环绕太阳运转的力量源于两种东西，一是行星和太阳的质量，二是他们之间的距离。
He decided that the strength of the force keeping a planet in orbit around the sun depended on two things. One was the amount of mass in the planet and the sun. The other was how far apart they were.
他认为，让一颗行星在其轨道上环绕太阳运转的力量源于两种东西，一是行星和太阳的质量，二是他们之间的距离。
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