有时当两个特定的行星，例如金星和火星，行进至同处，他们之间产生的化学反应将强于单个行星所能产生的能量。
Sometimes when two certain planets travel together, like Venus and Mars, they create a chemical bond that is stronger than each planet could ever be separately.
1976人们对于异星生命的存在感到很悲观。 当年海盗一号飞行器登录火星，用它伸出的机械臂抓起了一掊红色的火星尘土并进行了化学测试。
Things were not looking so good for alien life in 1976, after the Viking I spacecraft landed on Mars, stretched out its robotic arm, and gathered up a fist-size pile of red dirt for chemical testing.
相似的土壤分布得如此广泛，表明一个酸性海洋曾覆盖了大范围的火星表面，或许曾存在具有同样化学特性的众多湖泊。
Such a broad dispersal of similar soils argues for an acidic sea stretching across large swaths of Mars, or perhaps lakes with the same inherent chemistry.
地质特征暗示着火星上曾经流动着液态水，而现在悄无声息的死火山也曾经一度繁荣，在地表和火星内部进行着化学物质交换。
Geologic features imply that liquid water once flowed across the surface, and volcanic activity, now dead, once flourished, recycling chemicals and minerals between the surface and the interior.
莱特纳还举例说明，我们向火星发射的探测器上带着一些特异的抗体，可以检测细菌以及一些生命活动所产生的化学物质。
For instance, Leitner said, we can send rovers to Mars carrying antibodies that detect traces of chemicals and bacteria that would indicate life.
第三种形式的非热逸过程叫做光化学逃逸，只见于火星，但土卫六也可能存在这种现象。
A third nonthermal process known as photochemical escape operates on Mars and possibly on Titan.
在火星上有大量的冰块，但是当水结冰时，形成生命的化学反应就会停止。
There is plenty of ice on Mars, but the chemical reactions for life come to a halt when water freezes.
我们能够搜寻其它恒星，寻找象火星这样离我们很近的行星上的简单生命形式，并且在实验室中可以对生命起源的化学机理作更广泛的研究。
We can search for planets of other stars, seek simple forms of life on such nearby planets as Mars, and perform more extensive laboratory studies on the chemistry of the origin of life.
科学家们发明了一项新技术，用来分析由美国国家航空航天局的火星勘测轨道飞行器获取的火星表面化学成分图，这才有了这项发现。
Thee discovery was made when scientists developed a new technique to analyze chemical maps of the surface of Mars obtained by NASA's Mars Reconnaissance Orbiter spacecraft.
火星甲烷的特定同位素组成能揭示它的来源是生物化学活动还是来自于地质化学过程。
The Mars methane's specific isotopic makeup could reveal whether its origins are biochemical or geological.
火星甲烷的特定同位素组成能揭示它的来源是生物化学活动还是来自于地质化学过程。
The Mars methane's specific isotopic makeup could reveal whether its origins are biochemical or geological.
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