This site provides a current look at what theorethical cosmologists know about our universe and it also examines the fundamental properties of the universe which have not yet been measured and quantified. It also describes the milestones in cosmology such as the discovery of the expansion of the universe, the role of type Ia supernovae, simulations of large scale structure, detection of dark matter by examining clusters of galaxies and gravitaional lensing, and also the Cosmic Microwave Background.