Strange, never-before-seen circles of radio waves have been discovered in space. Researchers in Australia say what is producing the "odd radio circles"—or ORCs—is unknown.

The Australian Square Kilometre Array Pathfinder telescope array spotted strange radio circles A mysterious circle of radio waves has been detected, the fifth odd radio circle (ORC) ever spotted ...

For the last couple of years, astronomers have pondered the origins of massive rings of radio waves in space, called odd radio circles (ORCs), that encompass entire galaxies.

Odd radio circles (ORCs) are gigantic rings of radio waves. Only five have ever been sighted, and never in such spectacular detail.