英语听力：自然百科 金星和水星旅行指南 Venus and Mercury-7
时间：2014-05-29 06:29:27
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（单词翻译）
Like Mercury, the earth takes a beating from the sun's violent temper. Flares1, sun storms and other solar hissy fits can cause electronic mayhem for the satellites that roam above our heads.
Fortunately, the earth is protected from this radiation by a magnetic shield, a kind of force field generated by our molten iron core.
Planetary magnetic fields shield planets, their surfaces and their atmospheres, from charged particles that are always coming off the sun.
The auroras that light up our polar skies are evidence of our protective shield\ at work. Without it, life would not exist here. Visit Mercury, and you will be visiting the only other planet in the inner solar system with a magnetic field. But its very existence defies explanation.
Now the mystery there is that in order to have a magnetic field, you need to have an interior to the planet that is at least
partially2 molten. Mercury, one of the smallest planets, would have been expected to be really frozen all the way through. And yet, we have a
relatively3 strong, very well defined magnetic field that appears to have a source that's located deep in the planet.
Whatever
mechanism4 is driving Mercury's magnetic field, it's too weak to protect it from the full force of the sun. The solar wind
buffets5 Mercury's thin atmosphere. And in the process, it puts on a light show.
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