An estimated 99.85 percent of the mass of our solar system is contained within the Sun, while the planets collectively make up most of the remaining 0.15 percent.
太阳占据了太阳系总质量的大约99.85%，而在剩余的0.15%中，行星占据了大部分。
That makes it the biggest known crater in our solar system and it may well be the oldest.
这使它成为太阳系中已知最大的陨石坑，也可能是最古老的陨石坑。
Other planets in our solar system lack the oxygen atmosphere that helps explain why life exists on Earth.
我们太阳系的其他行星缺乏氧气大气层，这有助于解释为什么地球上存在生命。
Our planet Earth, together with other planets, revolve around our Sun in what is called our Solar system.
我们的行星地球，连同其他行星，围绕我们的太阳旋转，这就是我们的太阳系。
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。
The orderly nature of our solar system leads most astronomers to conclude that the planets formed at essentially the same time and from the same material as the Sun.
我们太阳系的有序特性使大多数天文学家得出结论，这些行星基本上在同一时间形成，且物质来源和太阳的一样。
Instead of normal planets whose composition could be predicted by theory, the planets populating our solar system are unique individuals whose chemical and tectonic identities were create.
我们的太阳系中的行星不是那些可以通过理论预测其组成的普通行星，而是独特的个体，它们的化学和构造特征都是由它们创造的。
The absence of an oxygen atmosphere on Mars and other planets in our solar system means that these planets also lack an ozone shield that would protect surface-dwelling life from UV radiation.
在火星和我们太阳系的其他行星上没有氧气，这意味着这些行星也缺乏保护地表生物免受紫外线辐射的臭氧层。
This arc is 65 times larger than the diameter of our solar system.
这个弧形比太阳系直径的65倍还要大。
Clouds swirl on Saturn, the second largest planet in our solar system.
云层在土星上打漩涡，土星是太阳系中第二个大行星。
A similar phenomenon happens to the planets of our solar system, Shull added.
类似的情况在太阳系的行星中也有发生。
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。
And the universe outside our solar system seems to abound with potential homes.
太阳系外茫茫宇宙之中，似乎充满了可能的生命家园。
A Nasa graphic which illustrates how the Oort Cloud surrounds our solar system.
这幅美国宇航局的图示说明了奥特云如何包围着我们的太阳系。
In our solar system, planets for the most part have fairly uniform circular orbits.
在太阳系，大多数的行星都各自拥有统一的圆周轨道。
Astronomers have detected more than 400 planets orbiting stars beyond our solar system.
天文学家已经探测到太阳系外超过四百颗环绕恒星运行的行星。
As in our solar system, vast distances stretch between these stars and their gas giants.
正如在我们的太阳系一样，恒星与其气态巨行星之间相隔甚远。
Nasa says the dwarf planet on the edge of our solar system is becoming increasingly red.
美国宇航局说，这颗太阳系边缘的矮行星正在越变越红。
Among all the planets in our solar system, earth is also one of the most unstable planet.
地球是太阳系中最不稳定的行星之一。
A massive dark object may be lurking on the edge of our solar system, according to scientists.
据科学家称，可能存在大型暗星体潜伏在我们太阳系的边缘。
Synopsis: Six years ago NASA discovered the possibility of alien life within our solar system.
剧情简介：6年前，美国太空总署发现了太阳系中存在外星生物的可能性。
Our solar system arose from a large, rotating cloud of interstellar debris called the solar nebula.
太阳系形成于一个巨大的旋转星云——太阳系星云，星云中含有大量的星际残骸。
Space agencies are identifying hundreds of planets outside our solar system that could harbour life.
人类的空间科学机构正在识别太阳系之外，可能存在生命的数百个行星。
Mister Sagan was deeply involved in American efforts to explore the planets in our solar system.
萨根先生积极参与美国对我们太阳系各个行星的探测工作。
They believe that our solar system has a hidden 'companion' that has so far remained undetected.
他们认为，我们的太阳系拥有一个隐藏的“同伴”，而这个“同伴”目前为止一直没有被探测到。
This image captures a momentary line-up looking out along this fundamental plane of our solar system.
这幅图片从黄道平面的视角捕捉到地球、月球和太阳排成一条直线的瞬间画面。
From there it was a simple matter to calculate where such worlds could exist within our solar system.
我们很容易就能计算出太阳系中的哪些地方会存在这样的星体。
Finding these planets, known as exoplanets since they are located outside of our solar system, is difficult work.
这些行星叫系外行星，因为它们处于太阳系以外。要找到它们可不容易。
The sun is by far the largest object in our solar system, containing 99.8 percent of the solar system's mass.
太阳是我们已知的太阳系内最大的天体，占有太阳系总质量的99.8％。
The sun is by far the largest object in our solar system, containing 99.8 percent of the solar system's mass.
太阳是我们已知的太阳系内最大的天体，占有太阳系总质量的99.8％。
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