信使号探测器是第一进入行星轨道的航天器。
Messenger is the first spacecraft to go into orbit around the planet.
X行星轨道与太阳之间的黑暗双胞胎。
请算出该小行星轨道可能的最小偏心率的值。
Please find the minimum possible value of the eccentricity of the asteroid's orbit.
月球行星轨道效应和太阳活动均与旱涝有明显的对应关系。
点击这里查看一系列描绘暗行星可能轨道的精美图片。
For a series of excellent graphics depicting the Dark Star's possible orbit, click here.
地球是沿轨道围绕太阳运行的九大行星之一。
The earth is one of mine planets which move in orbit round the sun.
用这种方法最容易发现大量运行轨道接近它们的宿主恒星的行星。
The method most easily finds very massive planets that orbit close to their host stars.
天文学家早就认为,几大行星的轨道是可以预测的。
Astronomers had thought that the orbits of the planets were predictable.
行星在它轨道上运动。
而这颗行星就以螺旋线的形式游弋到现在所占据的轨道上。
阿波罗型小行星因定期地穿越地球轨道而构对地球的威胁。
Apollo asteroids pose a threat to our planet as they routinely cross Earth's orbit.
彗星像行星一样围绕太阳运转,但其轨道是长长的椭圆形状。
Comets move around the sun like planets, but in a long oval pattern.
据《科学》杂志报道,这颗神秘的X行星的运行轨道远在海王星之外。
Science magazine reports that the mysterious "Planet X" moves in a distant orbit beyond Neptune.
轨道交叉,但行星间也许不会太接近。
这就是为何要寻找轨道合适的小行星的原因。
That is the reason for the search for asteroids with appropriate orbits.
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.
这里是该行星在其绕行轨道上最接近太阳的地方。
一种因引力而沿轨道绕行星旋转的天体。
A heavenly body kept in orbit around a planet by gravitational force.
然而,事实上这颗行星的轨道在我们称之为的可居住的区域。
However, this planet, in fact, orbits in what we call the habitable zone.
一方面,他是椭圆的,但是其他行星的轨道都是接近圆的。
根据定义,一颗行星必须能够清除其轨道附近的其它天体。
Accordimg to the definition, a planet must have a clear neighbourhood around its orbit.
其中许多行星的轨道距其主恒星极近,因此这些行星是炽热的。
Many of them orbit precariously close to their parent stars, so they scorching hot.
第一定律(轨道定律):所有行星都沿各自的椭圆轨道运动,太阳在该椭圆的一个焦点上。
The orbit of every planet is an ellipse with the Sun at a focus.
彗星象行星一样绕太阳运转,然而其轨道呈狭长的椭圆形。
Comets move around the sun like planets, but in long oval course.
当一颗行星绕它的轨道运行时,它能来回牵引恒星。
地球是沿轨道围绕太阳运行的九大行星之一。
The earth is one of nine planets which move in orbit round the sun.
有时某个小行星会脱离这条轨道,并撞向地球。
它可能不是那种至少我们所知道的生命形式能够舒适生存的环境。不过这个行星实际上是在一个我们叫做“可居住带”的轨道上运转。
It might not be the sort of place that, at least life as we know it, would find to be a comfortable environment.
它可能不是那种至少我们所知道的生命形式能够舒适生存的环境。不过这个行星实际上是在一个我们叫做“可居住带”的轨道上运转。
It might not be the sort of place that, at least life as we know it, would find to be a comfortable environment.
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