This article is from New Scientist and talks about the FRBs (Fast Radio Bursts) that have been detected along with an apparent 187.5ms spacing anomaly that appears in the data to dateand for which there is no current explanation.
http://www.newscientist.com/article/mg22630153.600-is-this-et-mystery-of-strange-radio-bursts-from-space.html#.VRxnzeHuqzE (http://www.newscientist.com/article/mg22630153.600-is-this-et-mystery-of-strange-radio-bursts-from-space.html#.VRxnzeHuqzE)