Ever since it began its operations in 2022, the James Webb Space Telescope has come across supermassive black holes from the early universe that had grown too big, too fast to be explained by existing ...

Two ways of measuring how fast the universe is expanding disagree, a puzzle known as the Hubble tension. Tiny magnetic fields from the Big Bang may offer a solution.

The James Webb Space Telescope is forcing cosmologists to redraw the schedule of the early cosmos. Structures that were supposed to take hundreds of millions of years to assemble are turning up almost ...