10 fast radio bursts have been detected in the past 15 years that all have the same unusual characteristic of an arrival delay close to a multiple of 187.5. There is no known natural process to explain this. Initially the bursts appeared to be coming from billions of light years away, far outside of our own galaxy. But recent analysis suggests that they may be coming from a group of objects in the Milky Way. Michael Hippke of the Institute for Data Analysis in Germany and John Learned at the University of Hawaii say that if the pattern is real, it is very hard to explain. There is a 5 in 10,000 probability that the line up is a coincidence. If it is a natural process, perhaps in some way involving pulsars, it is the result of a physics that we don't yet understand.
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