Cosmology HOME
Jump to Tools Naked Eyes The First Telescopes Early Reflectors Golden Era of Refractors Spectroscopy and the Birth of Astrophysics Rebirth of the Reflector New Tools
The Greek Worldview The Start of Scientific Cosmology The Mechanical Universe Island Universes The Expanding Universe Big Bang or Steady State? The Journey Continues
Site Map

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

Back: The Journey Continues

Exhibit Home