Cosmology is the study of the universe at large: its thermal and dynamical history, the origin and nature of its contents and structures on the largest scales. Our physical model of the universe, the "Hot Big Bang", is motivated by fundamental physics and rooted in observational fact. Given the scale of the questions we ask in cosmology, it's amazing that we really know so much!

Our acceptance of the Hot Big Bang model is driven by fundamental observations:

Other observations teach us a great deal about the history of the universe and the nature of its contents. Some of the most fundamental and amazing facts include:

CMB Polarization resources: