For decades, physicists specializing in subatomic particles have expected to find an entirely new species of matter, a type never seen on Earth,
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, swarming throughout the vastness of space. Galaxies rotate too rapidly and clump too closely if the only source of gravitational force is the matter that glows in visible light. Something else must be out there — an invisible,
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, unidentified source of gravity that does not glow like stars or gas. In fact, most (roughly 85 percent) of the matter in the cosmos,
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, astronomers have long known,
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, must be dark.
Billions of these dark matter particles ought to be passing through your body every second. Your body wouldn’t notice, but large, sophisticated detectors should record a vibration or flash of light when a dark matter particle collides with an atomic nucleus in the detecting material.
And yet such experiments repeatedly come up empty. In August and September,
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, for instance,
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, three search teams reported no luck detecting dark matter particles (SN: 11/12/16, p. 14). These were just the latest disappointing reports from similar searches over the last two decades. (One search,
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, from a detector in Italy called DAMA/Libra,
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, does claim dark matter detection, but nobody can confirm it and hardly anybody believes it.)

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