When you live at one of the most isolated corners of the planet, a dog really is man's best friend.
如果你居住在这个星球极其荒凉的一隅，那么狗会是你最好的朋友。
We are reproducing ourselves at such a rate that our numbers threaten the ecology of the planet.
我们繁衍得如此之快，以至于人口数量威胁到地球的生态系统。
Our galaxy is so huge that dozens of lesser galaxies scamper about it, like moons orbiting a giant planet.
我们的银河系实在庞大，吸引着数十个较小的星系环绕着它奔跑，恰似环绕巨大行星旋转的卫星。
Leo's royal star Regulus and red planet Mars appear in a colorful pairing just above the horizon in this starry skyscape.
狮子座的王者之星轩辕十四和红色行星火星，在这地平线上繁星闪耀的天空中交相辉映。
Since the lifetime of a planet like ours is several billion years, we can expect that, if other civilisations do survive in our galaxy, their ages will range from zero to several billion years.
由于我们这样的行星的寿命是几十亿年，我们可以预测，如果我们星系中有其他生物生存，它们的年龄将从零到几十亿岁不等。
Earth's midsection bulges and the catastrophic land displacement caused a small reduction in the bulge, making the planet more round.
地球中部是稍稍膨胀的，历经灾难的陆地位移导致了隆起的轻微减少，让地球变得更圆。
At some point the debt will be called in, and all those service—the things which the planet does for us for free—will grind to a halt.
在某一时刻，债务将被收回，所有这些服务——地球免费为我们做的那些事情——将慢慢终止。
Though Pluto has officially lost its lofty title of "planet", a rebellion against its demotion is brewing.
尽管冥王星正式失去了它行星的高级头衔，但是反对这一降级的行动正在酝酿之中。
Rock on a planet is also important.
行星上的岩石也很重要。
Once, there was a little grey planet.
曾经，有一个小小的灰色星球。
After many years of scrutinizing, astronomers have found a planet that is similar to the Earth.
经过多年的仔细研究，天文学家发现了一颗与地球相似的行星。
Only by protecting the environment can we assure our later generation of a beautiful planet.
只有通过保护环境，我们才能向子孙后代承诺给他们一个美丽的地球。
Earth is a rocky planet where there is liquid water, which is necessary for life to exist.
地球是一个岩石行星，这里有液态水，这是生命存在的必要条件。
The very first thing that scientists discovered with a mission to another planet was that Venus was not at all the earthly paradise that fiction had portrayed.
科学家们在前往另一颗行星的任务中发现的第一件事就是，金星根本不是小说中描绘的人间天堂。
And yet, for the first time, in the history of the planet, a species has the technology... to prevent its own extinction.
但是，在这个星球的历史上，第一次有了一个种群能够通过掌握科技的力量，避免自身的毁灭！
Forget Gaia, save a marsh; forget the planet, save a frog.
忘记地球，去拯救一片湿地；忘记行星，去拯救一只青蛙。
From the small number of impact craters that appear on Martian lava flows, one can estimate that the planet was volcanically active as recently as a half-billion years ago—and may be active today.
从火星熔岩流上出现的少量陨石坑中，我们可以估计，在5亿年前，这个星球上的火山还很活跃——也许现在依然活跃。
The fact that we now imagine our planet as a whole does not mean that the "rescue" of our planet will come with one big global stroke of genius and technology.
事实上，我们现在认为所在的星球是一个整体，这并不意味着对我们星球的“拯救”能靠着一次全球性的天才之举和技术就能实现。
If there are so many stars out there, that means there might also be a planet just like the planet we live on.
如果那里有那么多星星，那就意味着可能也有一颗和我们居住的行星一样的行星。
The largest terrestrial planet, Earth has a diameter only one quarter as great as the diameter of the smallest Jovian planet, Neptune, and its mass is only one seventeenth as great.
最大的类地行星地球的直径仅仅是最小的类木行星海王星的四分之一，而且地球的质量仅仅是其质量的十七分之一。
In 1664 Hooke observed a reddish spot on the surface of the planet.
1664年，胡克观察到了那颗行星表面的一个微红的斑点。
Until recently, scientists believed that life on other planet was just a hopeful dream.
直到最近，科学家们还认为其他星球上的生命只是一个充满希望的梦。
Mercury is a liquid metal, and mercury, the planet, is the fastest moving naked eye heavenly body. Mars, why is Mars red?
水银是一种液态金属，而水星这颗行星，是肉眼能看到的运动最快的天体。火星，为什么火星是红色的？
As MESSENGER flies by Venus, ESA's Venus Express spacecraft will also be capturing science data on the planet, a prospect that excited Solomon.
当“信使”号飞经金星的同时，ESA的“金星快车”飞船也在这颗行星上获取科学数据，这一前景令Solomon兴奋。
I hope with the help of people like those at PETA, we can all make our planet a more humane, compassionate home for all its residents, both human and nonhuman.
我希望在像PETA这一类人们的帮助下，能让我们这个星球成为它的子民(包括人类与非人类)一个更仁道、更慈悲的家。
The standard theory of planet formation holds that no planet that large could be formed so close to a star, leading to the suggestion that the body is a companion star.
行星形成的标准理论认为，没有一颗如此大的行星能在如此靠近恒星的地方形成，因此才有人推测该天体是一颗伴星。
When a large body strikes a planet or moon, material is ejected, thereby creating a hole in the planet and a local deficit of mass.
当一个大型天体撞击行星或月球时，物质会被抛射出去，从而在行星上形成一个洞，造成局部质量不足的现象。
Venus has long been held up as a cautionary tale for everything that could go wrong on a planet like earth.
长期以来，金星一直被认为是一个警示故事，告诉我们在像地球这样的行星上，任何事情都可能出错。
The most likely outcome of continuing rises in greenhouses gases will be to make the planet a further 3C hotter by 2100, although the report acknowledges that rises of 4.5C to 5C could be experienced.
温室气体持续增多的最可能后果是，到2100年为止将使地球温度升高3摄氏度，尽管报告认为有可能温度提升4.5到5度。
The most likely outcome of continuing rises in greenhouses gases will be to make the planet a further 3C hotter by 2100, although the report acknowledges that rises of 4.5C to 5C could be experienced.
温室气体持续增多的最可能后果是，到2100年为止将使地球温度升高3摄氏度，尽管报告认为有可能温度提升4.5到5度。
应用推荐