In a ‘Dark Dimension,’ Physicists Search for the Universe’s Missing Matter

When it comes to understanding the fabric of the universe, most of what scientists think exists is consigned to a dark, murky domain. Ordinary matter, the stuff we can see and touch, accounts for just 5% of the cosmos. The rest, cosmologists say, is dark energy and dark matter, mysterious substances that are labeled “dark” partly to reflect our ignorance about their true nature.

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