E-Mail IMAGE: A burst from the periodically active repeating fast radio burst source 20180916B arrives at the LOFAR telescope. The higher frequency radio waves (purple) arrive earlier than the lower frequency radio... view more Credit: Futselaar / ASTRON / Tendulkar Since fast radio bursts (FRBs) were first discovered over a decade ago, scientists have puzzled over what could be generating these intense flashes of radio waves from outside of our galaxy. In a gradual process of elimination, the field of possible explanations has narrowed as new pieces of information are gathered about FRBs - how long they last, the frequencies of the radio waves detected, and so on.