|
 |
|
Density of Galaxies |
|
|
|
|
|
 The density of galaxies in a wedge of sky out to some ten billion light-years (red is densest). The tiny quantum variations in the initial big bang have been magnified as space expanded while gravity drew masses of gas together. That created concentrations of galaxies with enormous holes between. Measurements of the scale of this 'foamy' structure reveal much about the present nature of matter in the universe as well as its history. Image courtesy Sloan Digital Sky Survey |
|
 Copyright ©. Brought to you by the Center for History of Physics, a Division of the American Institute of Physics |
