Cosmologists are increasingly entertaining a radical possibility: that the cosmos might fold back on itself so that, on the ...

When people picture the universe, they imagine everything still out there, sitting in space waiting to be discovered. The truth is far stranger. Most of the universe has already slipped out of view ...

If you look across space with a telescope, you'll see countless galaxies, most of which host large central black holes, billions of stars and their attendant planets. The universe teems with huge, ...