水星大气及表面成分光谱仪（MASCS）：获取日照和背阳面大气成分剖面；在紫外波段对外溢层尾迹观测；
Mercury Atmospheric and Surface Composition Spectrometer (MASCS): Profiles of atmospheric composition on the day and night sides;
“信使号”将探索水星的表面、地壳、大气，甚至其磁场。
Messenger will explore the surface of Mercury, its crust, its atmosphere and even its magnetic field.
地球被水域所包围，或者是大部分被外围水域所包围，我们拥有大气层，火焰，月亮，水星，金星，太阳等等。
The earth is surrounded by water or largely surrounded by water beyond that we have the sphere of air then fire then the sphere of the moon, mercury, Venus, the sun and so on.
微粒的飞溅不仅在水星上空形成了一个超级稀薄的大气层（更准确的说是外大气层），而且还改变了水星地表的颜色，反射比，以及化学成分。
The impacts also change the colour, reflectance and chemistry of the surface over time.
土卫六一直以来都是这项探测任务的主要聚焦点，因其体积比水星还要大，是唯一一颗拥有浓密大气层的卫星。
Titan was a major focus of the mission all along, since it's bigger than the planet Mercury and the only moon massive enough to have a significant atmosphere.
值得一提的是水星没有大气层，所以没有可以从高热量区向陨石流通的热能。
Mercury has no atmosphere to speak of, so there's no way for heat to circulate from the hot regions into the craters.
但是如果不是水星上厚厚的大气层留住了热量，那些永久背光的地区很可能有积存了几百万或是几十亿年的冰存在的。
But without a thick atmosphere to trap heat, it is possible that permanently Shadowed regions could stay cold enough to preserve ices for millions, if not billions, of years.
这将解开水星密度为何如此之高，水星的两极是否存在冰以及水星的大气从何而来等疑问。
It will clear up questions about its curiously high density, whether it has ice at its poles and where its atmosphere comes from.
他创造出一系列外星生物，诸如水星人哈摩里斯，一种以声音为食、身体薄如纸片、生活在大气圈外的物种。
He created RACES of alien creatures, such as the Mercurian Harmoniums, a species of paper-thin extra-terrestrials who lived on sound.
火星太干燥又缺氧，金星太热，水星也一样。除此之外，太阳系的其他行星的温度都接近绝对零度，并围绕着以氢气为主的大气层。
Mars is too dry and poor in oxygen, Venus far too hot, and so is Mercury, and the outer planets have temperatures near absolute zero and hydrogen-dominated atmospheres.
水星几乎没有大气层，这意味着生命。
Mercury has virtually no atmosphere, meaning life as we know it is impossible.
水星几乎没有大气层，这意味着生命。
Mercury has virtually no atmosphere, meaning life as we know it is impossible.
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