In addition to other effects, a nuclear weapon detonated in or above the earth's atmosphere can create an electromagnetic pulse (EMP), a high-density electrical field.

除了其他影响，在地球大气层中或之上引爆的核武器会产生一种电磁脉冲(EMP)，这是一种高强度的电场。

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Unlike the sun, whose density is such that it supports nuclear fusion that generates bright sunlight, Gliese 581 is a red dwarf, so-called because the star is small and dim.

与太阳不同，太阳密度太高，能够支持生成强烈太阳光的核聚变，而Gliese 581是颗红矮星，之所以这么叫是因为这个恒星又小又暗。

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The density of this gas was close to what's needed for nuclear fusion, the researchers said.

这种气体密度接近于核聚变所需要的数值，研究人员说。

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Simple math shows that a marginal gas or oil well has a power density at least 22 times that of a wind turbine while a nuclear power plant has a power density that is more than 8 times that of a solar photovoltaic facility.

FORBES: Magazine Article

Nor can they compare to the power density of sources like natural gas, oil and nuclear.

FORBES: Magazine Article

While conspiracy theorists may want to believe that Big Oil, Big Coal and Big Nuclear are stifling the growth of renewables, the simple truth is that coal, oil, natural gas and nuclear can satisfy the Four Imperatives: power density, energy density, cost and scale.

FORBES: Magazine Article