Astronomers appear to be closing in on the source of enigmatic radio pulses emanating from space that have become the subject of intense scientific speculation. From a new report:About 30 of these objects have been discovered deep in space since the first was detected, all but one burping out a cataclysmic radio pulse exactly once and then disappearing into the night. Only one burster, known as FRB121102, after the date it was discovered (Nov. 2, 2012), has repeated itself, hundreds of times now.