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.

Astronomers used an array of telescopes to find the most massive radio jet in the early universe. The celestial object is hundreds of thousands of light-years long.

So far, four of the objects have been found, all of them circular and otherwise unexplained. Three of them have glowing edges.

“These mysterious objects are candidate galaxies in the early universe, meaning they could be very early galaxies,” said Haojing Yan, co-author of the study. As light travels for billions of years, ...

Astronomers used an array of telescopes to find the most massive radio jet in the early universe. The celestial object is hundreds of thousands of light-years long.

The giant black hole is the oldest one found so far, and was likely formed more than 13 billion years ago, researchers say.

'Ghosts of the radio universe': Astronomers have discovered a slew of faint circular objects Radio astronomers see what the naked eye can't. As we study the sky with telescopes that record radio ...