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Astronomers spot the most powerful and distant 'odd radio circle' ever seen
With help from citizen scientists, astronomers have found the most powerful and distant "odd radio circle" ever detected.
Deep in outer space, astronomers have discovered another "odd radio circle" — the latest in a short list of mysterious rings ...
It can be confusing to drive in a roundabout or traffic circle. Here are the rules to follow, and the differences between the two.
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