“信使”号探测器在六年半前开始了它的太阳系之旅，直到今年三月十八日才进入水星轨道。
The Messenger began its trip through the inner solar system six and a half years ago, and it entered orbit around Mercury on March 18.
(美国)宇航局称，NASA的一个航天器开始绕水星轨道航行，成为第一个环绕太阳系最内侧行星飞行的航天器。
A NASA spacecraft began orbiting Mercury, becoming the first to fly around the solar system's innermost planet, the space agency said.
(美国)宇航局称，NASA的一个航天器开始绕水星轨道航行，成为第一个环绕太阳系最内侧行星飞行的航天器。
NASA spacecraft began orbiting Mercury, becoming the first to fly around the solar system's innermost planet, the space agency said.
停在太阳周围轨道的太空探测器也许依然完好。
Space probes parked in orbit round the sun might lie dormant yet intact for an immense period of time.
在太阳质子事件期间，传输到近地轨道的太阳高能质子通量显著增强，给飞行器安全带来挑战。
In solar proton events, flux of solar energetic protons increases significantly in low earth orbit, which posts a challenge to space crafts' safety.
在太阳同步轨道卫星上应用的辐射制冷器都采用两级抛物面w型的结构形式。
The radiant cooler used in the sun synchronous orbit is always designed two stages with a W-shaped parabolic reflector.
展开后的太阳能电池板面与探测器轨道轴成30度俯角。
After deployment, the solar panel plane is canted by 30? To the spacecraft pitch axis.
但是如果能让飞行器变大或者利用小行星，我们就可以让地球轨道远离太阳。
But, if we were to increase the spacecraft's size, or use an asteroid, we could potentially move the earth's orbit away from the sun.
我们提出了一个方法，用于辨明太阳系中小型天体的重力场和近地表下的质量分布，而不需要专门的轨道器或着陆器。
We propose a method for discerning the gravity fields and sub-surface mass distribution of a solar system small body, without requiring dedicated orbiters or landers.
太阳同步回归轨道既可以满足光照条件的要求，又可以满足时间分辨力的要求，是对地观测航天器首选轨道之一。
Repeat sun-synchronous orbit is one of the most important orbits for earth observation missions, because the orbit can satisfy the requirements of illumination and temporal resolution.
太阳同步回归轨道既可以满足光照条件的要求，又可以满足时间分辨力的要求，是对地观测航天器首选轨道之一。
Repeat sun-synchronous orbit is one of the most important orbits for earth observation missions, because the orbit can satisfy the requirements of illumination and temporal resolution.
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