Looming billions of light years away, astronomers have spotted an enormous double-ring structure — itself hundreds of thousands of light years across — that glows spectacularly in radio wavelengths. And, tantalizingly, they can’t fully…
Looming billions of light years away, astronomers have spotted an enormous double-ring structure — itself hundreds of thousands of light years across — that glows spectacularly in radio wavelengths. And, tantalizingly, they can’t fully…