Astronomers have detected an asteroid not far from Earth, moving in the same orbit around the Sun.
天文学家在距离地球不远处发现一颗小行星，它与地球在同一轨道上围绕太阳运行。
The JPL team takes orbit data from the Minor Planet Center and refines it, asteroid by asteroid.
喷气推进实验室从小行星中心获得轨道数据，并逐颗核对确定小行星的轨道。
Scientists would like to know if Phobos is a captured asteroid or formed in orbit, and whether it had, or has, water.
科学家们想知道火卫一是被火星捕获的小行星还是在轨道上形成的星体，还想了解火卫一上是否有水或曾经有过水。
This artist's animation illustrates a massive asteroid belt in orbit around a star the same age and size as our Sun.
从这个艺术化的图片可以看到在围绕一个和太阳年龄和大小相当的恒星轨道上有一个巨大的小行星带。
PASADENA, Calif. - Send a robot into space. Grab an asteroid. Bring it back to Earth orbit.
加州帕萨迪纳市——将机器人发射入太空，抓取一个小行星，然后把它拖回地球轨道。
This capsule, it is hoped, will contain material from Itokawa, a half-kilometre-long asteroid whose orbit crosses the Earth's.
这枚太空舱，如不出所料，将会装有系川小行星上的矿，这颗半公里长的小行星的轨道经过地球。
He ran it through MPC's orbit-projection software, which can tell how close an asteroid will come to Earth, and phoned Chesley to alert him of an impending collision.
他立即运行中心的轨道预测软件，计算小行星离地最近距离，然后打电话警告切斯利一场即将发生的小行星撞地球。
And they'll want to: an NEO is any asteroid or comet that will come within about 30 million miles of Earth's orbit.
他们会：一个近地天体可能是出现在大约3000万英里的地球轨道内的任何小行星或彗星。
ScienceDaily (July 18, 2011) -nasa's Dawn spacecraft on July 16, 2011 became the first probe ever to enter orbit around an object in the main asteroid belt between Mars and Jupiter.
2011年7月16号，NASA的曙光探测器进入位于火星和木星之间的小行星带，成为进入这一地带的第一个探测器。
It is the first probe to enter orbit around an object in the main asteroid belt between Mars and Jupiter.
它是为进入火星和木星之间的小行星带中环绕一个天体的轨道而进行的第一次探索。
In this case, the orbit of the rotating asteroid will very slowly spiral in toward the sun.
在这样的情况下，旋转小行星的运行轨道将非常缓慢地向朝着太阳的方向盘旋。
The central idea behind a Space Elevator involves lowering a cable — perhaps constructed from asteroid material — from geostationary Earth orbit to the surface of the Earth.
太空升降机背后的核心理念包括降下一根电缆——也许是由小行星材料制成的，——从对地静止轨道到地球表面。
If the asteroid is less massive, its gravity is weaker and it would have taken the spacecraft longer to achieve orbit.
小行星越微小，它的引力就越虚弱，那航天器进入它的轨道所花的时间就越长。
If all goes to plan, then on July 16th Dawn, the largest robotic probe ever launched by America's space agency, will drop into orbit around Vesta, the second-largest member of the asteroid belt.
如果一切按计划行事，那么，7月16日，美国航天机构有史以来发射最大的机器人探测器——“黎明”号——将顺便进入小行星带第二大成员——灶神星——的轨道。
Most of them orbit the Sun in the asteroid belt, which lies between the orbits of Mars and Jupiter.
它们中的大多数在小行星带中绕太阳作轨道运行，小行星带位于火星轨道和木星轨道之间。
This asteroid takes 238 years to orbit the sun.
这颗小行星需要花238年绕太阳运行一周。
After a year of studying Vesta, Dawn is scheduled to leave orbit and, in 2015, approach the only asteroid-belt object that is larger: Ceres.
一年后，黎明号探测器将离开灶神星的轨道，计划在2015年到达谷神星，它是小行星带中唯一一颗比灶神星大的小行星。
But running the object's orbit backwards showed that the asteroid never came close enough to Earth during the space age to have started life as a rocket booster.
但是追溯、反向分析它过去的轨道位置表明这个小家伙在人类太空时代不可能近距离靠近地球，也就不可能是火箭助推器了。
But running the object's orbit backwards showed that the asteroid never came close enough to Earth during the space age to have started life as a rocket booster.
但是追溯、反向分析它过去的轨道位置表明这个小家伙在人类太空时代不可能近距离靠近地球，也就不可能是火箭助推器了。
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