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 ...

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 ...

Astronomers believe they have discovered a new, bizarre type of cosmic object that is invisible to all wavelengths of light except radio. The strange circular objects in question have been ...

E.T. phone the former royals. A flying saucer was allegedly spotted hovering near Harry and Meghan’s $14 million mansion outside Los Angeles. A mysterious circular object was seen in the mountains ...