现在，冥王星可能是个矮行星，但是，亲爱的克莱德，在我书中你仍然是第一个发现行星的美国人。
Pluto may be a dwarf planet now, Clyde baby, but you're still the first American to discover a planet in my book.
它要拍摄第一批类地行星的图片。
这看起来越来越象一个探索系外行星的黄金时代。
This is looking more and more like a golden age of exoplanet discovery.
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。
Mister Sagan was deeply involved in American efforts to explore the planets in our solar system.
“火山作用非常重要，因为它代表着行星的脉搏，”他补充道。
"Volcanism is important because it represents the pulse of the planets," he added.
该发现有助于解释水是怎样成为地球之类石质行星的组成成分的。
This discovery could help to explain how water comes to be incorporated into rocky planets such as the Earth.
这些由银河系众多恒星锻造出的重元素正是类地行星的构建模块。
Forged by the Milky Way's abundant stars, such heavy elements are the building blocks of terrestrial planets.
对类似地球的太阳系外行星的磁场探测将会给探寻外星生物带来一线光明。
Detecting a magnetic field surrounding an Earth-like exoplanet would prove a promising sign for finding extraterrestrial life.
这可能是类地行星的演化方式，月球正在期待我们回去探索，让真相水落石出”。
This could be the way terrestrial planets evolve and the Moon is begging us to go back and explore to figure that out.
知道新发射的那颗卫星吗，说是去寻找银河系里其他和地球一样有生命的行星的那颗？
How about this satellite they just launched that will look for Earth-like planets in our galaxy that might contain life?
因此我们利用现有的观测技术——多普勒技术所做的研究正是找到类地行星的最初几步。
So what we're doing right now with our observational technique, the Doppler technique, is taking really the very first steps to finding Earth-like planets.
一种测量方法是测量这颗行星的光谱，这样可以探测到其大气中是否有氧气或其他生命迹象。
One way to find out would be to measure the planet's light spectrum, which could reveal molecular oxygen or other possible signs of life in its atmosphere.
这项研究将来也许可以为天文学家搭建用以选择太阳系外适合生存的行星的望远镜提供帮助。
The study may help astronomers build telescopes to pick out life-friendly extrasolar planets in the future.
同时，这些新发现行星的体积和轨道彻底改变了科学家对行星系形成和进化过程的认识。
Meanwhile, the sizes and orbits of planets already discovered are revolutionizing researchers' understanding of how planetary systems form and evolve.
重重障碍减缓了它们的速度，使它们能够以组成新一代恒星和行星的材料充实孕育恒星的气体云。
These impediments slow their speed, so they can enrich star-forming gas clouds with the ingredients for new generations of stars and planets.
但是在接下来的几年内，天文学家期待着发现几十个在大小上大致类似于我们这颗行星的星外地球。
But within the next few years, astronomers expect to find dozens of alien earths that are roughly the size of our planet.
其轮盘和齿轮制造出一种可携带的太阳系天体仪，可以预测恒星和行星的位置，也能预测月食和日食。
Its wheels and gears create a portable orrery of the sky that predicted star and planet locations as well as lunar and solar eclipses.
每天我们看到几百双眼睛，但是甚至不会怀疑它们有着如此美丽的结构，就像未知行星的表面一样漂亮。
Every day we see hundreds of eyes but do not even suspect they have such beautiful structure, like surfaces of unknown planets.
随着发现地外行星的脚步不断加快，加上宇宙中含有无数的恒星，等着我们的还有更多的惊人发现。
With a rapidly increasing pace of discovery of exoplanets and a practically infinite number of stars in the universe, many other exciting discoveries are ahead of us.
此类突破进展如今正在革新科学家对这些遥远行星的认识，在接下来的几十年内可能将能够发现生命迹象。
These kind of breakthroughs are now revolutionizing what scientists now know of these distant planets, and could in upcoming decades be capable of finding signs of life.
但该发现给天文学家带来希望，随着越来越多太阳系外行星的发现，我们可在其中找到数十个可居住星球。
But the find bolstered astronomers' hopes that dozens of habitable worlds will show up as more and more exoplanets are discovered.
Schneider说，接下来的一个世纪内，望远镜甚至可能先进到能够探测太阳系外行星的生命迹象。
A century from now, telescopes might even become good enough to detect signs of life on exoplanets, Schneider said.
装备了一架可以同时观测超过10万颗恒星的望远镜，开普勒搜寻着由行星的凌日现象所产生的微弱光线。
The craft, which is armed with a telescope that can track more than 100,000 stars simultaneously, looks for slight diminutions of light caused by planetary transits.
最近在距离水星表面几百千米的空中拍摄的一组照片很可能会为行星的起源以及水星的地貌历史提供新线索。
Its latest pictures from just a few hundred kilometres above the surface are expected to provide important new clues to the origin of the planet and its geological history.
恒星的形成对星系的演化很重要，对行星的产生也很重要——包括适宜人居住的或者不适宜人居住的行星。
Star formation is vital to galaxy evolution and the production of planets, both inhabited and uninhabited.
一个困扰着行星科学家的问题是：海洋是怎样在像地球这样由硅酸盐和金属组成的石质行星的表面形成的？
One question that has baffled planetary scientists is how oceans formed on the surface of terrestrial planets like Earth — rocky planets made of silicate and metals.
所以，如果你曾经对天外来客心存恐惧，那么现在请放松自己，把注意力转移到这些小行星的科学价值上来。
So if you've ever cowered under your covers at the thought of an asteroid impact, lighten up and try to focus on their scientific importance.
所以，如果你曾经对天外来客心存恐惧，那么现在请放松自己，把注意力转移到这些小行星的科学价值上来。
So if you've ever cowered under your covers at the thought of an asteroid impact, lighten up and try to focus on their scientific importance.
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