2020科学发现：定期发到地球的无线电信息

A Canadian-led team of astronomers, including researchers from the University of Toronto’s Dunlap Institute for Astronomy & Astrophysics, has discovered that a repeating fast radio burst (FRB) originating from a nearby galaxy pulses at regular intervals.Researchers with the Canadian Hydrogen Intensity Mapping Experiment (CHIME) Fast Radio Burst Collaboration used the CHIME telescope in British Columbia to show that the repeating radio source known as FRB 180916.J0158+65 – first discovered in 2018 by the same group – pulsates every 16.35 days.The findings, described in a study published recently in Nature, are the first to demonstrate that repeating FRBs can burst predictably.FRBs were discovered over a decade ago. First thought to be singular events, astronomers have since learned that some of these high-intensity blasts of radio emissions, in fact, repeat.Though the explanation for the mysterious phenomenon is still elusive, the new study is another step towards determining what might be causing FRBs.Earlier this year, astronomers in Europe, in partnership with the CHIME/FRB Collaboration, were able to pinpoint FRB 180916 to a nearby galaxy located 500 million light years from Earth. Astronomers worldwide are now studying the source with a variety of telescopes, in the hopes of explaining the repetition.