Cosmologists are increasingly entertaining a radical possibility: that the cosmos might fold back on itself so that, on the largest scales, space behaves like a vast mirror maze. Instead of stretching ...

Cosmologists are finally beginning to sketch a coherent picture of the universe we cannot see, using exquisitely detailed maps of galaxies, ghostly light and the large scale structure of space itself.

Astronomers have discovered "dust-shrouded supermassive black holes" in the early universe, less than 1 billion years after the Big Bang—a type of object that had previously escaped detection. An ...