As Kepler showed, the Earth's orbit is an ellipse, with the sun at one of the two focal points.
开普勒曾表明，地球的轨道是一个椭圆，这个椭圆有两个焦点，太阳在其中一个上。
A big moon likely could have helped stabilize Mars' orbit, but the planet has just two small moons, most likely captured asteroids, that don't have much gravitational muscle.
一个月亮很可能帮助稳定火星的轨道，但是它也有两个小的卫星，很可能是被捕获的小行星，他们根本就没有足够的引力能束缚。
The project started in 2000, when the first two Beidou satellites were launched into geostationary orbit.
该项目始于2000年，当时最初两颗北斗卫星发射到地球静止轨道。
The European Space Agency has launched into orbit, two space observatories that will help scientists understand the information of the universe.
欧洲航天局将两个太空望远镜发射进入轨道，将帮助科学家理解宇宙信息。
Sometimes a single planet with an elongated, or elliptical orbit can look the same as two planets that trace perfect circles around their stars.
有时候如果一个行星的轨道是拉长的或是椭圆的，那就有可能被当做轨道吻合的两颗行星。
Although our solar system only has one star, most stars like our sun are not solitary, but are binaries where two stars orbit each other a pair, or multiples involving even more stars.
虽然我们的太阳系只有一颗恒星，但其实大部分和我们太阳相似的恒星都不是单个的，而是由两个恒星相互旋转组成的双星系统，或者甚至包含更多恒星的多星系统。
The orbit of the earth around the sun is eccentric because the orbit is slightly elliptical and so has effectively has two centres (neither of them the centre of the sun).
地球环绕太阳的公转轨道是偏心的，这是因为地球的公转轨道稍微呈椭圆形，所以这个轨道实际上就有两个中心（这两个中心都不与太阳的中心重合）。
Last year, two satellites even collided, showering their orbit with tiny fragments that now pose additional risk to operational spacecraft.
去年甚至还发生了两颗卫星相撞的事件，碰撞所产生的碎片散布在整个轨道上，更增加了其他航天器的运行风险。
The trip, which lasted more than two days, was the first to take the shuttle into orbit.
这次持续超过两天的飞行是航天飞机第一次进入太空轨道。
The delay disappointed the astronauts' families, who were waiting at Kennedy Space Center for their loved ones' return after nearly two stressful weeks in orbit.
计划的推迟让宇航员的家属们很失望，他们正在肯尼迪航天中心等待亲人在近两周艰苦的太空工作后能平安归来。
The unmanned probe launched March 31, 1966, and entered orbit around the moon two days later.
这艘无人驾驶的航天器发射于1966年3月31日，并在两天后进入绕月轨道运行。
The larger of the two will loft the lunar lander and other equipment into Earth orbit.
两者中较大的一个将发射月球着陆器和其它的设备进入地球轨道。
Russian space experts will pick one of the two men, both Muslims, to go into orbit on September 2 next year.
俄罗斯航空专家将从两人中挑选一名于明年9月2日进入太空。
Dawn, which launched in September 2007, is on track to become the first spacecraft to orbit two solar system destinations beyond Earth.
2007年9月发射的曙光号一直在成为第一个进入地球之外两个太阳系系统目的地的轨道的路上。
And we may have to wait a very long time for a planet like Earth to orbit its star twice: Alien astronomers would have to wait two years to observe our planet transiting the sun twice.
而且，我们可能需要等待一个很长的时间才能等到一个类地行星第二次围绕它的恒星作轨道运行：外星系的天文学家们要花两年的时间才能看到两次我们的地球绕太阳运行。
The communications vessels collided at more than 3,000m per second - the first major smash between two operational satellites in Earth orbit.
当时，在地球轨道上以时速3000米每秒的高速运行的两颗发生了对撞。
The idea was two decades ahead of its time, and helped to attach his name to the geostationary orbit above the equator.
这个想法领先于那个时代20年，环赤道同步静止轨道也因此以他的名字命名。
M3 was one of two Nasa instruments among 11 pieces of equipment from around the world on Chandrayaan-1, which was launched into orbit around the Moon in October last year.
于去年10月发射进入绕月轨道的月球初航1装配了由世界各国提供的11件探月设备，月球矿物制图仪的是由美国宇航局提供的两个仪器之一。
Two often merge after an average mutual orbit of 500 million years-romance in the heavens we now can see clearly for ourselves. -gretchen parker.
两个星系通常要经过5亿年相互旋转才能汇合在一起——而此刻我们眼前上演的正是这一出太空浪漫剧。
Two Chinese astronauts are currently in orbit practicing procedures and testing technologies for the space station.
两名中国航天员现在在轨道上测试太空站的相关技术。
Russia has more than 100 satellites in orbit. Two-thirds of them are military or dual-purpose spacecraft, RIA Novosti said.
根据俄新社报道，俄罗斯拥有超过一百颗人造卫星，其中的三分之二是军用或者多用途航天器。
The spacecraft will orbit about once every 12 hours and fill in the visual gaps left by it's two earlier flybys and the images snapped by Mariner 10 between 1974 and 1975.
它每十二小时绕水星一周，将填补早先它两次飞掠和水手十号1974、1975年照片的视觉视角。
A second mission in 2005 put two astronauts into orbit for a week, and a third manned launch is planned for next year.
在2005年的第二次任务中，两名宇航员送上了太空一周，第三次的载人任务发射按计划将在明年开始。
A second mission in 2005 put two astronauts into orbit for a week, and a third manned launch is planned for next year.
在2005年的第二次任务中，两名宇航员送上了太空一周，第三次的载人任务发射按计划将在明年开始。
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