Earth has been at the receiving end of mysterious radio emissions every two hours. After more than a decade, the source of these signals has finally been identified, nearby the Big Dipper. A new research paper published in Nature Astronomy points to a red dwarf and white dwarf star,

Radio telescopes detect signals from billions of years ago, but radio-frequency interference presents challenges.

In the past three years, astronomers have discovered a mysterious new type of radio source. We call these long-period transients.