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Images Show Entire "Universe" of Circular Structure That Can Only Be Seen as Radio Signals

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Radio astronomers are uncovering an entire "low surface brightness universe" Teeming with circular curiosities, including a new class of cosmic oddities.

Two of them are stellar oddities known as a Wolf -Rayet star, perhaps 25 times heavier than the Sun , near the end of their relatively brief lifespans.

One of the most mysterious of all is the latest instance ( Odd Radio Circles ), which is a phenomenon exclusively visible to the wavelength of radio signals.