A mysterious circle of radio waves has been detected, the fifth odd radio circle (ORC) ever spotted, but its cause is still unclear. It could simply be the side view of a galaxy with an active black hole at its centre, although it might be the result of a supermassive black hole merger.
In 2020, Ray Norris at Western Sydney University, Australia, and his colleagues found four strange circles made from radio waves in space. No one had …
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