Dark energy is even more of a challenge: it comes neither from known particles nor from the empty space between them.

暗能量的研究则更加富有挑战性：它既不来自于已知的任何粒子，也不来自于粒子之间的真空区域。

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This orthodox view of the universe is now being challenged by astronomers who believe that a heavy "rain" of gas is falling into many galaxies from the supposedly empty space around them.

这种正统的宇宙观现在正受到天文学家的挑战。天文学家认为，一场巨大的气体“雨”正从星系周围所谓的空无一物的空间落入许多星系中。

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If particles no get their masses from interacting with the empty space Higgs field, then the Higgs particle must exist; but we can't be certain without finding the Higgs.

如果粒子质量是从“空”的空间里面的希格斯场的作用而产生，那么希格斯粒子必然存在。但是找不到希格斯粒子之前，我们不能确定到底是怎么回事。

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They offer a unique geography, flora and fauna (including a pleasingly spine-chilling collection of venomous creatures), fascinating traces of the country's first inhabitants, and enough empty space to give visitors from more crowded places agoraphobia.

ECONOMIST: A survey of Australia

Ed Marx, who worked at the Chrysler plant in the 1960s and now owns retail space in downtown Belvidere, said he is holding a number of his empty storefronts from the market because he knows the interest isn't there yet.

WSJ: Car Plant Brings Wary Hope