They can also be made sterile, which germ-infested humans, who risk spreading disease around the solar system, cannot.
它们还能无菌地工作，而携带有细菌的人类有可能会在太阳系传播疾病，故无法做到这一点。
The two spacecraft are the most distant human-made objects, out at the edge of the heliosphere — the bubble the sun creates around the solar system.
这两艘飞船是目前距离最遥远的人造物体，远在日光层外缘——由太阳产生的，环绕太阳系的巨型泡状体。
This technology has been pushed by some scientists as an alternative means of travelling around the solar system instead of conventional chemical fuels.
这项技术作为化学燃料的替代而广受科学家推崇。
The recent discovery of the geysers on Enceladus added a second twist, making planetary scientists wonder if there are even more such hot spots scattered around the solar system.
行星科学家们现在怀疑是不是还有更多这样的“热点”分布在太阳系里。
The goal was to measure the AU; then, knowing the orbital speeds of all the other planets around the Sun, the scale of the Solar System would fall into place.
目标是测量AU；随后，当我们知道了所有围绕太阳的其他行星的轨道速度，对太阳系的规模就有充分的认识了。
The nearly circular orbits of planets in our solar system led scientists to expect that planets around other stars would also reside in circular orbits.
在我们的太阳系中，行星的轨道几乎是圆形的，这使得科学家们预测，其他恒星周围的行星也会位于圆形轨道上。
Of course, we now know that the planets, including Earth, revolve around the Sun, and that the solar system is only a tiny part of the universe.
当然，我们现在知道，包括地球在内的行星都围绕太阳公转，而太阳系只是宇宙的一小部分。
Mars's orbit around the Sun is the fourth fastest orbit of all the solar system planets.
在太阳系所有行星中，火星绕太阳的轨道速度第四快。
Our Solar System has the most planets of any known star, most probably because it is so hard to detect planets around other stars.
我们的太阳系是已知的恒星星系中拥有行星数量最多的，这很可能是由于在其他的恒星周围探测到行星的存在是非常困难的。
Like our solar system, the planets around Gliese 581 have nearly-circular orbits.
Gliese 581周围的行星拥有同太阳系的行星一样类圆形轨道。
Observations of dying stars, their metal content, and how they affect the planets around them could provide clues about the fate of our own solar system.
濒死恒星的观察值，它们的金属含量，以及它们如何影响到围绕它们旋转的行星，都能为我们的太阳系的命运提供线索。
And not just man. The whole Earth was made from dust particles in orbit around the primitive sun, as were all the other solid objects in the solar system.
而且不仅仅人是尘土造的，包括地球在内的、整个太阳系的固体物质都是由环绕早期太阳的尘埃造的。
The distance to the moon was also known and a few centuries later, the sun was known to be at the center of our solar system with the planets in orbit around it.
几个世纪后，地球到月球的距离也为人所知，太阳被公认为是我们太阳系的中心，系内所有的行星都围绕着它旋转。
This notion has been used to successfully explain phenomena in our solar system, such as the slight alterations in Mercury's orbit around the sun, which Newton's gravity couldn't account for.
这个观点成功的解释了我们太阳系中的现象，例如，水星绕太阳轨道的微小变动。这是牛顿的引力定律所无法解释的。
If we plot the position of the sun around the sky in a year, it will mark out a different circle in the sky which is the plane of the ecliptic of the solar system.
如果我们将太阳在天空中的一年内运转轨迹描出，这将是另一个循环，这平面就是整个太阳系的黄道。
The Oort cloud is a vast belt of dust and ice that is believed to lie around one light year from the Sun and is the origin of many of the comets that pass through our solar system.
奥尔特云是一个由粉尘和冰组成的庞大云带，据信它距离太阳约一光年，许多穿越我们太阳系的彗星都来自那里。
In the 16th century, Copernicus put forth his controversial concept of a heliocentric solar system, in which the planets revolved around the sun — not the Earth.
16世纪，哥白尼提出了颇具争议的日心说，认为行星围绕太阳运转而非地球。
Our solar system is about 4.5 billion years old, but the galaxy is much older; there were stars and planets around long before Earth even existed.
我们所在的太阳系已经存在了约45亿年，但银河系的历史要早得多；早在地球形成之前，银河系就已经存在了恒星和行星。
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.
“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。
Astronomers have now found six planets in orbit around Gliese 581 - the most discovered in a planetary system other than our own solar system.
天文学家在Gliese 581周围已经发现了六颗行星——除了我们的太阳系之外，Gliese 581是人类发现行星最多的行星系。
The little flock of golden birds continued to twitter in circles around her head so that she looked like a strange, feathery model of the solar system.
那群金黄色的小鸟继续围着她的脑袋叽叽喳喳地飞着，这使她看上去像一个奇怪的、长着羽毛的太阳系模型。
In the past 13 years, scientists have discovered more than 300 planets outside our solar system, but they have done so indirectly, by measuring changes in gravity, speed or light around stars.
过去的13年中，科学家已发现我们太阳系以外的行星300多颗，但都不是直接观察到的，而是通过测量恒星周围引力、速度或光的变化而发现的。
Before the formation of the sun and planets, all the chemical elements found on the periodic table were floating around in the primordial dust of the Solar System.
在太阳和行星形成之前，所有元素周期表上的化学元素在太阳系的原始尘埃中四处漂浮着。
The surface of mercury is splattered with craters, the majority being formed in the early days of the solar system when rocky bodies moving at high speeds around the sun collided with the planet.
汞的表面散落的陨石坑，其中大部分是在太阳系形成的早期岩石天体时左右与地球相撞的太阳高速移动。
In a solar system in which orbits cross each other, resonances can keep the planets in stable tracks around their stars.
在太阳系，就有轨道相互交叉，共振能保持其稳定的轨道的例子。
In our solar system eight planets circle around the sun. What are they? Can you match the names with the planets?
在我们的太阳系中有八颗行星绕着太阳转。它们是谁？你能把行星和名字匹配起来吗？
Galileo was the first scientist, and person, to question the Church's statement that the Earth was the center of the solar system, and all other planets and the Sun revolved around it.
当时教会认为，地球是太阳系的中心，其他行星和太阳都围绕地球运动。伽利略是质疑这一说法的第一位科学家，第一个人。
Galileo was the first scientist, and person, to question the Church's statement that the Earth was the center of the solar system, and all other planets and the Sun revolved around it.
当时教会认为，地球是太阳系的中心，其他行星和太阳都围绕地球运动。伽利略是质疑这一说法的第一位科学家，第一个人。
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