The mystery of vast 'cosmic ORCs' — odd radio circles that encompass entire galaxies — may be solved 

 Mysterious "odd radio circles" or ORCs that compass entire galaxies may have finally been explained, with astronomers pointing the finger at winds from bursts of supernova star explosions. 

https://cdn.mos.cms.futurecdn.net/TjtpyCqeHdAedNf58Eu5o9.jpg

https://www.space.com/odd-radio-circles-cosmic-orcs-mystery-solved