The Universe has differing physical structure over a range of distances that exceed 10⁴⁰. This is a staggering number; by comparison, the total number of people on the Earth today is considerably less than 10¹⁰; the total estimated number of stars in the observable Universe is only something like 10²².

From quarks to atoms to bacteria to people to stars to galaxies to superclusters, all these scales intermix and fade into one another. Here, we can examine them.