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。
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。
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。
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。
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 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。
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。
Simply stated, a gas molecule can "evaporate" from a planet if it reaches a speed known as the escape velocity.
简单地说，如果气体分子达到逃逸速度，它就能从一颗行星上“蒸发”。
Extracting information about the large-scale composition of a planet from a sample weighing a millionth of a gram was a fascinating example of scientific endeavour.
从重量为百万分之一克的样品中提取有关行星宏观组成的信息是一个极为有趣的科学尝试实例。
The steady deterioration of the very climate of this very planet is becoming a war of the first order, and by any measure, the U.S. is losing.
这个星球气候的持续恶化正在发展为一场至关重要的战争，不论以哪种标准衡量，美国都在输掉这场战争。
However, if the planet is in a good position, astronomers look for three key things: water, air and rock.
然而如果这颗行星处于很好的位置，天文学家会寻找三样关键的东西：水、空气和岩石。
Pluto may be a dwarf planet now, Clyde baby, but you're still the first American to discover a planet in my book.
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。
Scientists want to bring a chunk of the red planet down to Earth on what's called a sample-return mission.
科学家们希望将这颗红色星球的一大块带回地球，进行所谓的取样返回任务。
It will nevertheless resemble us in that it should communicate with its fellows, be interested in the Universe, live on a planet orbiting a star like our Sun.
但是它仍然与我们相似，因为它应该也与它的同伴交流，对宇宙感兴趣，生活在一个行星上，这个行星也绕着像是太阳一样的恒星运转。
Maybe the story is telling us if we don't look after the planet, a day will come when flowers can only grow on the moon.
也许这个故事告诉我们，如果我们不爱护这个星球，总有一天，花就只能在月球上生长。
Earth—our home and our planet, is a truly amazing place to live.
我们的家园和星球——地球，是一个非常适合居住的地方。
Now, I understand that you are from a planet called Zadernol.
我知道你来自一个叫扎德诺尔的星球。
It's China's first probe to land on a planet other than Earth.
这是中国首个在地球以外的星球着陆的探测器。
Mars is a planet and is the fourth closest planet to the Sun.
火星是一颗行星，是离太阳第四近的行星。
Last month, a space agency told the public that they were looking for "a planet protection officer."
上个月，一家航天局对公众宣称，他们正在寻找“行星保护官”。
Clearly, the planet cannot keep such a high rate of forest loss.
显然，地球无法保持如此高的森林损失率。
Want to make a difference to our planet?
想要改变我们的星球吗？
One day, a little boy Jim was walking on the planet, when he passed a cave and noticed a small red flower inside.
一天，一个小男孩吉姆在这个星球上行走，当他经过一个洞穴时，他注意到里面有一朵小红花。
Pictures and videos sent back by China's first Mars probe allowed us to see this red planet at such a close distance.
中国首个火星探测器传回的图片和视频让我们在如此近的距离看到了这颗红色星球。
A Life on Our Planet is his latest work.
《地球上的生命》是他最新的作品。
A Life on Our Planet is his latest work.
《地球上的生命》是他最新的作品。
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