Radio astronomers see what the naked eye can't. As we study the sky with telescopes that record radio signals rather than light, we end up seeing a lot of circles. The newest generation of radio ...

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There's something unusual lurking out in the depths of space: Astronomers have discovered four faint objects that at radio wavelengths are highly circular and brighter along their edges. And they're ...

Photograph of a vibrating wavemaker whose circular arc shape leads to focused waves. A disk is trapped near the focal point. Summer brings with it the sight of surfers moving seamlessly across wave ...