A search for par t i cles of the mys te ri ous “dark mat ter” thought to per vade our uni verse—de scribed as the most am bi tious such ef fort to date—has turned up none.
Most phys i cists ac cept that dark mat ter, though in vis i ble, ex ists, mostly on grounds that it ex erts strong gravita t ional ef fects in space that no vis i ble struc tures can ex plain.
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