If dark matter is made from WIMPs, they should be all around us, invisible and barely detectable. So why haven’t we found any yet? While they wouldn’t interact with ordinary matter very much, there is always some slight chance that a dark-matter particle could hit a normal particle like a proton or electron as it travels through space. So, researchers have built experiment after experiment to study huge numbers of ordinary particles deep underground, where they are shielded from interfering radiation that could mimic a dark-matter-particle collision. The problem? After decades of searching, not one of these detectors has made a credible discovery. Earlier this year, the Chinese PandaX experiment reported the latest WIMP nondetection. It seems likely that dark-matter particles are much smaller than WIMPs, or lack the properties that would make them easy to study, physicist Hai-Bo Yu of the University of California, Riverside, told Live Science at the time.
The Sci-Fi 