The cosmic microwave radiation map of the 13.77 billion-year-old universe. Color differences indicate temperature fluctuations within a range of ±200 microKelvin. The map enabled the proportion of matter, dark matter, and dark energy to be estimated as 5.6%, 24%, and 71.4%, respectively. The map enabled composition as well as interactions among the components of the universe to be inferred. The dark energy explains many cosmologic observations, including the flat topology. Image from the NASA/WMAP Science Team.