The cosmic superstructure Quipu is more than 13,000 times the length of the Milky Way, and its mass is 200 quadrillion times ...

This visualization presents a 3-D view of the largest structures in the universe. It begins with data from the Sloan Digital Sky Survey and zooms out to reveal data from WMAP.

And Mandelbrot himself wondered if the universe is a fractal. If, as we zoom out, we will see the same kinds of structures appearing again and again. And in a way, that's what we see: a hierarchy ...