小行星是较小的行星，它们中的大部分在火星和木星轨道间的小行星带中环绕太阳运行。
Asteroids are minor planets, most of which circle the sun in a region known as the asteroid belt, between the orbits of Mars and Jupiter.
这意味着那些星球要与我们的家园有着近似的大小，并且在一条距离合适的轨道上环绕母星运行，而这个距离要使得水能够以液态的、能孕育生命的形式存在。
That meant they'd have to be about the same size as our home world, orbiting their parent star at about the right distance for water to exist in liquid, life-nurturing form.
因为有卫星的头衔，而且沿椭圆形轨道环绕地球运行，月亮似乎每天平均51分钟返回到天空的同一地点。
Due to the moon's titled and elliptical orbit around Earth, the moon seems to return to the same place in the sky 51 minutes later each day, on average.
当这个盘状物开始合并成为一组原行星时，它们的引力拉动着盘状物周围气体所凝聚的硬块，一起环绕着恒星作轨道运行。
When the disk begins to coalesce into protoplanets, the gravity of those protoplanets pulls clumps of gas around the disk with them as they orbit the star.
在灶神星轨道呆了一年之后的“黎明”号将在太空旅行中进行一次罕见的表演- - -它会重新点燃发动机并转变方向环绕另一个天体运行。
After spending a year in orbit around Vesta, Dawn will perform a trick rare in space travel-it will reignite its engines and head off to orbit another body.
黄道平面是一个假想的平面，理论上它包含了地球环绕太阳运行的轨道。
The ecliptic plane is defined as the imaginary plane containing the Earth's orbit around the sun.
次照片是由安装在火星侦察轨道器上功能强大的HiRISE像机所拍摄，该探测器自2006年以来一直在环绕着这颗红色星球运行。
The picture was taken by the powerful HiRISE camera on board the Mars Reconnaissance Orbiter - a probe that has been circling the Red Planet since 2006.
在船帆星座发现的环绕橙色矮星的行星，这颗行星被命名为毫无诗意的HD85512b，正绕着一颗橙色矮星轨道运行。
The unpoetically named HD85512b was discovered orbiting an orange dwarf star in the constellation Vela.
细小的原子核内含不带电荷的中子及带正电荷的质子，而带负电荷的电子则沿轨道环绕原子核运行，情况就好像行星环绕太阳运行一样。
The nucleus consists of uncharged neutrons and positively charged protons. negatively charged electrons travel around the nucleus in their orbits, similar to the way planets moving around the sun.
最近环绕这颗红色行星轨道运行的nasa的全球监测机构最终提供了一些可靠的答案。
NASA's Mars Global Surveyor, currently in orbit about the Red Planet, is finally providing some final answers.
极地轨道气象卫星以大致南北方向环绕地球运行。它的轨迹离地面约数百公里。
Polar-orbiting satellites are low-flying satellites circling the earth in a nearly north-south orbit, at several hundred kilometers above the earth.
极地轨道卫星经两极上空环绕地球运行，期间不断拍摄地球上不同的地区。
Polar-orbiting satellites revolve around the Earth along paths roughly passing over the poles. As they move, they obtain images of different parts of the Earth.
太阳系中的每个行星环绕太阳运行的轨道都比它的内邻星要长。
Each of the planets in our solar system takes a longer path round the Sun than its neighbour.
环绕原子核作轨道运行而且将它们的特征供给给原子的电子，也被认为是根基粒子。
Electrons, which orbit atomic nuclei and give atoms their distinctive characters, are also considered fundamental particles.
月球环绕地球一周需29.5天，可是他的运行轨道并不是完美的圆。
The moon makes a trip around Earth every 29.5 days. But the orbit is not a perfect circle.
日内瓦天文台的两位天文学家已经测定了一颗环绕飞马星座中某一恒星作轨道运行的行星的位置。
TWO ASTRONOMERS from the Geneva Observatory have spotted a planet orbiting a star in the constellation Pegasus.
日内瓦天文台的两位天文学家已经测定了一颗环绕飞马星座中某一恒星作轨道运行的行星的位置。
TWO ASTRONOMERS from the Geneva Observatory have spotted a planet orbiting a star in the constellation Pegasus.
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