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At last we might have found a clue to one of the greatest unexplained mysteries in physics

Seekers of dark matter are getting very excited. But has this elusive particle, which holds the key to where the universe’s mass is hidden, really been discovered?

By Philip Ball  

Photo: Nasa

The world of fundamental physics has been set abuzz with the announcement of a possible sighting of something unknown. The prominent XENON1T collaboration, which operates a detector buried beneath Gran Sasso mountain in central Italy, announced on 17th June that it had seen a signal above “known backgrounds,” meaning that it may have detected particles of unknown origin—perhaps with some of the characteristics expected of a hypothetical candidate particle for dark matter. To put it in the simplest terms, it is possible that the project has finally…

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