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。
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。
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。
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”。
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。
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。
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。
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。
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。
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。
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”。
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。
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。
The bigger the hull the less turns it takes to colonize a planet.
船体越大，拓殖一个星球的机会也就越少。
“A pirouette of two stars and a planet can be stable, ” explains Dr Koch.
一颗行星与两颗恒星能够组成一个稳定的旋转系统。
When you see a planet by a transit, the orbit has to be in your line of sight.
当你通过经纬仪看到行星，其轨道应该在你的视线中。
Because a planet that close to its star would dim the dwarf's light as it passes.
因为，当一颗靠近白矮星的行星路过它的时候，会使它发出的光线变的模糊不清。
In the case of a planet, the hole is carved out by an asteroid or comet impact.
对于行星，这个洞就是由小行星或彗星碰撞打开的。
They used it to detect methane in the atmosphere of a planet nearly 63 light-years away.
利用这项技术，他们测出距地球约63光年的一颗行星大气中含有甲烷。
A planet lighter than a ball of cork is one of the puffiest alien planets known to date.
根据数据已知，比一个软木塞球还轻的行星是最膨胀的外行星之一。
A super-Earth is a planet with a mass larger than Earth's, roughly up to 10 times greater.
超级地球是指那些比地球质量大的系外行星，它们的质量一般约为地球的10倍左右。
Did the star ignite helium at the core, swallow a planet, or swallow a companion star?
星体燃烧了核内的氦，吞并了行星或伴星吗？
Well all of a sudden we know we could have a planet teeming with complex and intelligent life.
好吧，我们突然知道我们可能是找到一颗行星，上面可能有充满了复杂的，有智慧的生命。
The flip side is the Medea hypothesis that says life is self-destructive and poisons a planet.
米迪亚假设的对立面说生命自我毁灭同时也污染着星球。
In the late 19th century scientists diagnosed a shortage of nitrogen as a planet-wide problem.
在19世纪晚期，科学家断定，缺氮将成为一个全球性的问题。
They are linked to the rest of the Earth: representatives of a planet studying itself in microcosm.
他们是与地球的其他部分联系在一起的，亦是这正在研究自身的星球的一个缩影。
Whether a planet can support life depends on the size and brightness of its star, that is its 'sun'.
一颗行星是否能够维持生命取决于它的恒星--即它的"太阳"--的大小和亮度。
Whether a planet can support life depends on the size and brightness of its star, that is its 'sun'.
一颗行星是否能够维持生命取决于它的恒星--即它的"太阳"--的大小和亮度。
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