有生命存在火星上吗？
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。
Earth is a rocky planet where there is liquid water, which is necessary for life to exist.
在所有可能有生命存在的空间里，地球上的生命只占一小条――创造性的一次尝试。
In the space of all possible lives, life on Earth is but a tiny sliver—one attempt at creativity.
首先，地球上适宜生命存在的气候取决于极其狭窄的轨道参数，这些参数定义了一个持续可居住的地带，在那里水可以以液态存在。
First, a climate conducive to life on Earth depends upon the extraordinarily narrow orbital parameters that define a continuously habitable zone where water can exist in a liquid state.
科学家们假定火星上没有生命存在。
生命存在的唯一时刻就是“现在”。
在外太空有生命存在。
一眼望去没有任何房屋或者生命存在的迹象。
这样的化学构成可能是生命存在的先决条件。
这么多的外行星当中又有多少是有生命存在的？
这一公式最初被用于估算外星生命存在的几率。
His quirky study USES a famous maths formula called the Drake Equation, which was first used to estimate the existence of extra-terrestrial life.
这次有关生命存在的发现地是土星最大的卫星—土卫六。
This one concerned the possibility of life on Saturn's largest moon, Titan.
柏拉图耗费了他一生中大量的时间去研究生命存在的本质。
Plato invested much of his life in the quest to understand and make known the true nature of being.
按照以往的惯例，这本应有个聚会：以示火星上有生命存在。
According to all the criteria, this should have triggered a party: it was a sign of life on Mars.
有证据表明，火星过去的环境也许更适宜生命存在。
Evidence also suggests that Mars may have been even more habitable in the past.
有可能维持生命存在的Gliese 581g为第四颗行星。
但是让我们相信确实有一个有生命存在的地方还是很难的。
But convincing ourselves of a place where something is actually living is very problematic.
博勒普通道冰原上单质硫沉淀存在的重要意义在于，这是生命存在的信号。
The very presence of elemental sulfur deposits on the ice in Borup Pass is an indicator that life is likely there.
尽管还未证实火星上确有生命存在，但科学家们相信，它们只是躲藏起来了。
Although no life has been confirmed on Mars, scientists are hopeful that it's just hiding.
然而之前发现的行星都离它们的恒星太近，高温断绝了任何生命存在的可能。
These discoveries have been of large fast-orbiting planets which are so close to their suns that they are far too hot to support life of any kind.
这两颗比地球略大的行星都不是类似于地球的，或者说有着生命存在的机会。
Neither of the slightly-bigger-than-Earth planets is Earth-like or has much chance for anything to live there.
也许，在宇宙的另一边，那些无法企及的未知处，有着和我们一样的生命存在。
So maybe life does exist as we do, just on the other side of the universe where we won't have the capability to find it.
在科学家极其隐晦的话语中，这表示生命存在所需要的基本条件已经被发现了。
In the very hedged language of the scientist, it means that conditions have been found that are consistent with the presence of that life.
许多相信大脚怪或者地外生命存在的人应当以诚信、诚实作为前提，不能误报。
Many people who believe in the existence of Bigfoot or extraterrestrials, for example, do so based on the faulty premise that sincere, honest eyewitnesses couldn't be mistaken.
科学家们现在认为，在银河系中，有生命存在条件的行星大约有1亿个。
Scientists now believe that there are likely to be around 100 million planets in the Milky Way that harbour exactly the right conditions for life.
这是一个没有人类的世界，你或许可以说没有任何生机，尽管有过去生命存在的证据。
This is a world without people, you might say without animation, though it teems with evidence of past life.
此外，这颗类似行星似乎还拥有大气层，它的地心引力与地球类似同时也能够支持生命存在。
Astronomers discover planet just 20 light years away withsimilar atmosphere and gravity which could support life
也就是说，这样一个与地球非常类似的星球居然适合居住，这也预示着寻找生命存在的大好前景。
This said, the fact that a planet so unlike the Earth could be habitable bodes pretty well for the search for life in general.
也就是说，这样一个与地球非常类似的星球居然适合居住，这也预示着寻找生命存在的大好前景。
This said, the fact that a planet so unlike the Earth could be habitable bodes pretty well for the search for life in general。
该项过程是生命存在的基础，它记述细胞如何利用基因密码合成生命体中的若干组成部分。
The process is fundamental for life and describes how cells use genetic code to produce the building blocks of living organisms.
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