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Last September, Catherine Heymans, one of the world’s leading cosmologists, was supposed to board a ferry for the northernmost island in the Orkney archipelago. The island, North Ronaldsay, is among the darkest inhabited places on earth. On a clear winter’s night, it is easy to be awed by the thousands upon thousands of stars visible to the naked eye, which spill their unpolluted light upon the Earth. Heymans, who is the first woman appointed astronomer royal for Scotland, was planning to explain to the island’s 60 or so residents that those stars, and the rest of the perceptible universe, represent a mere fraction of the stuff that makes up our cosmos. What she studies is everything we cannot see: the darkness.