A Dark InfluenceIn so doing, scientists aim to measure the influence of Dark Energy (DE), the mysterious force responsible for this expansion, which has been accelerating for the past four billion years. This led them to propose that another phenomenon was responsible for cosmic expansion, which came to be known as "Dark Energy." This organization monitors the cosmos using its 570-megapixel Dark Energy Camera (DECam) mounted on the 4-meter Victor M. Blanco Telescope located at the NSF Cerro Tololo Inter-American Observatory (CTIO) in Chile. In this latest analysis, the DES tested two models of Dark Energy against the six years of DES observations. In addition, their results confounded one of the four parameters used to measure cosmic expansion: the galaxy cluster parameter.