The Wilkinson Microwave Anisotropy Probe (WMAP), launched in 2001, has provided an extremely detailed map of the cosmic microwave background, a remnant from the Big Bang and the oldest light in the universe. This false-color image of the cosmic microwave background gives viewers a detailed snapshot of how the universe looked at a very young age. Colors have been assigned to slight fluctuations in temperature: warmer areas are red, while cooler areas are blue. A timeline shows the progression from the Big Bang to the instant of time depicted in the WMAP image to the present-day universe.