这篇雅思听力背景的主要内容讲的是一件奇事,就是某地天上掉钻石的事情。天上除了掉过雨滴,竟然还掉过钻石,这是什么原因呢,有什么影响呢,还有一件大家比较关心的八卦就是会不会经常下啊,在哪里呀?
Is It Raining Diamonds On Uranus
Berkeley - October 1, 1999 - If experiments at the University of California, Berkeley, are any indication, future explorers of our solar system may well find diamonds hailing down through the atmospheres of Neptune and Uranus.
These planets contain a high proportion of methane, which UC Berkeley researchers have now shown can turn into diamond at the high temperatures and pressures found inside these planets.
Once these diamonds form, they fall like raindrops or hailstones toward the center of the planet, said Laura Robin Benedetti, a graduate student in physics at UC Berkeley.
The team, led by Benedetti and Raymond Jeanloz, professor of geology and geophysics, produced these conditions inside a diamond anvil cell, squeezing liquid methane to several hundred thousand times atmospheric pressure. When they focused a laser beam on the pressurized liquid, heating it to some 5,000 degrees Fahrenheit, diamond dust appeared.
They report their experimental findings in a paper in the Oct. 1 issue of Science.
The demonstration that methane can convert to diamond as well as other complex hydrocarbons in the interiors of giant planets like Neptune hint at a complex chemistry inside gaseous planets and even brown dwarf stars. Brown dwarfs are small, dim stars barely larger than the largest gas giant planets.
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