“Astronomers solve mystery of ‘odd radio circle’ in deep space”

Since 2019, astronomers have puzzled over odd radio circles (ORCs), curious rings that pop up in sky surveys at radio wavelengths. At least one of the rings was likely caused by a burst of stars that formed in a distant galaxy and then exploded, blasting gas out into surrounding space, a team of astronomers told the American Astronomical Society meeting in New Orleans today. When that gas hits slower moving gas around the galaxy, it created a shock wave that generated an eerie ORC more than 10 times as wide as the Milky Way.








