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Detection of an oxygen atmosphere on Jupiter's moon Europa.

机译:在木星的月亮欧罗巴上检测到氧气气氛。

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Europa, the second large satellite out from Jupiter, is roughly the size of Earth's Moon, but unlike the Moon, it has water ice on its surface. There have been suggestions that an oxygen atmosphere should accumulate around such a body, through reactions which break up the water molecules and form molecular hydrogen and oxygen. The lighter H2 molecules would escape from Europa relatively easily, leaving behind an atmosphere rich in oxygen. Here we report the detection of atomic oxygen emission from Europa, which we interpret as being produced by the simultaneous dissociation and excitation of atmospheric O2 by electrons from Jupiter's magnetosphere. Europa's molecular oxygen atmosphere is very tenuous, with a surface pressure about 10(-11) that of the Earth's atmosphere at sea level.
机译:木卫二是木卫二发出的第二颗大型卫星,大约相当于地球月球的大小,但与月球不同,它的表面有水冰。有人建议,氧气氛应通过分解水分子并形成分子氢和氧的反应而在这种物体周围积累。较轻的H2分子将相对容易地从木卫二中逸出,留下富含氧气的气氛。在这里,我们报告了从欧罗巴探测到的原子氧排放的检测,我们将其解释为由木星磁层中的电子同时解离和激发大气中的O2产生的。欧罗巴的分子氧气氛非常脆弱,在海平面的表面压力约为地球大气的10(-11)。

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