Resumen de Subterranean sleuth rules out dark matter suspects
The darkness just keeps getting deeper. Despite tantalising early hints of a sighting, the most sensitive search yet for dark matter has come up empty. The result may spell trouble for theories of a shadow universe where myriad particles interact via their own dark forces. Dark matter is the invisible stuff thought to make up about 80 per cent of the universe's matter, and that gives away its presence only by exerting a gravitational tug on ordinary matter. The most popular dark matter candidates are weakly interacting massive particles (WIMPs).
