New data reveals a 3-million-light-year filament connecting two galaxies, each of which hosts a supermassive black hole.

By observing tiny ripples in spacetime called "gravitational waves" that propagate away from colliding black holes, ...

From our little perch inside the Milky Way, the image shows the universe stretching out for about a billion light years, which is only a small fraction of its total size. Each of the 50,000 dots ...