2262 - Planets gradually changing planetary orbit. Mars is threatened by comets.
2262年，行星们逐渐转变了自己的旋转轨道，火星被彗星威胁。
The orbit of Venus, the 2nd planet outward form the sun, comes closer to Earth than any other planetary orbit.
金星的轨道，围绕太阳外运行的第二颗行星，它比任何其它的行星轨道都靠近地球。
Kepler went on to show that an elliptical orbit is sufficient to explain the movement of the other planets and to devise the laws of planetary motion that Newton built on.
接着开普勒证明了这个椭圆轨道也能很有效解释其他行星的运行轨迹。然后他提出了行星运动定律，牛顿定律就是以此为理论基础的。
PLANETRISE: In an artist's conception, rocky moons orbit a gas giant in a distant planetary system.
行星升起：在艺术家的想像图中，在一个遥远的行星系统内，一颗岩石卫星围绕一颗气体行星旋转。
Its event horizon--theboundary at which nothing, not even light, can escape the monster’s gravitationalpull--is four times as large as the orbit of Neptune,our sun’s outermost planetary satellite.
在它的事件视界，即其边界，没有任何东西可以逃脱这头巨兽的引力，甚至连光也不行。 其引力相当于位于我们太阳系最外层行星轨道的海王星的四倍。
Solar power satellites that have been manufactured on the moon will have been placed in orbit around a number of planets and moons, providing nearby planetary outposts with continuous electric power.
由月球制造的太阳能人造卫星将被安置在许多行星及其卫星的轨道上，成为这些星球的观察站，并以太阳光为能源连续不断地工作。
Below the planetary display, each bit serial adder controls one element of the display, the orrery, each of them corresponding to calculate that planet's orbit.
下面显示的行星，每个位串行加法器控制，显示的元素，太阳系仪，其中每一个对应计算出地球的轨道。
The Planetary Society reported that the satellite reached its orbit and that all of its systems appeared healthy.
行星协会报告称，该卫星已经进入其轨道，并且所有系统正常。
Astronomers have now found six planets in orbit around Gliese 581 - the most discovered in a planetary system other than our own solar system.
天文学家在Gliese 581周围已经发现了六颗行星——除了我们的太阳系之外，Gliese 581是人类发现行星最多的行星系。
Planetary perturbations make the earth's orbit about the sun irregular.
行星的摄动使得地球绕太阳的轨道是不规则的。
Planetary perturbations make the earth's orbit about the sun irregular.
行星的摄动使得地球绕太阳的轨道是不规则的。
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