There's a lot of room in interplanetary, interstellar, and intergalactic space, but just how low the densities go is truly mind-boggling.
Here on Earth, there are enormous variations in the densities of what we commonly encounter. Solid, dense metals, like gold or tungsten, have very high densities. If you had a cube that was one meter (3 feet and 3.39 inches) on a side — a cubic meter... [16094 chars]