Cosmology is the study of the "large scale properties of the universe as a whole." In this set of sites, NASA provides information on the Big Bang Theory in a simplified language. The beginning, evolution, structure, fluctuations and...

Beginning with an image termed the "Brief History of the Universe" this site examines (briefly, as noted) a timeline of the universe as dictated by the image. The timeline includes information on the big bang theory, the dark ages, the...

PBS site explores the history of the Universe by providing users with a Universe Timeline exploring different theories. Site also contains links to a tour of the Universe, birth of a Supernova, additional resources and much more.