The infinitely adaptable substance has its dark side.

这种具有极强适应性的物质也有其黑暗的一面。

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Dark matter, a mysterious entity of longer standing, is some invisible but common substance that reveals itself only through its gravitational pull.

暗物质，一个长期存在的神秘实体，是某种不可见的普遍存在的物质，它们只通过其引力揭示自己的存在。

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Dark matter is thought to be an invisible substance that makes up almost a quarter of the mass in the universe.

人们认为暗物质是由将近占宇宙四分之一质量的不可见物质组成的。

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It could also cast light on the mystery of dark matter, a substance that pervades the universe in vastly larger quantities than familiar, visible matter, but whose existence can be inferred only by watching its gravitational effect on visible matter.

ECONOMIST: Particle accelerators

Cosmologists reckon that at least a quarter of the universe is composed of dark matter, a mysterious substance that neither emits nor absorbs light.

WSJ: New Data Boosts Case for Higgs Boson Find

So do candidates for the particles that make up dark matter, a shadowy substance whose presence can be deduced from its gravitational pull (see article) but which does not interact much via the three Standard-Model forces.

ECONOMIST: The hunt for physics��s most elusive quarry is over