9.3K views · 511 reactions | A mysterious force is accelerating the expansion of the universe. Scientists think dark energy may make up 68 percent of the total energy of the cosmos. The Wide Field Infrared Survey Telescope mission, managed here at Goddard, will study the mystery of dark energy using three different methods. Read more: https://go.nasa.gov/2NZLxVr | NASA’s Goddard Space Flight Center | Facebook