The original version of this story appeared in Quanta Magazine.
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 percent 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.
While no single idea is likely to explain everything we hope to know about the cosmos, an idea introduced two years ago could answer a few big questions. Called the dark
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