Space-based geoengineering approaches consist of the deployment of objects in space that can block or reflect sunlight away from the planet. Approaches include sunshades, reflectors or mirrors, and clouds of sun blocking particles. Researchers have proposed that these objects should be placed in orbit around the planet or at the L1 Lagrange point. The L1 Lagrange point is a specific location between the Earth and the Sun (about 1.5 million km from the Earth) where the gravity of the Earth and the Sun are approximately equal. At the L1 Lagrange point, very little energy would be needed to keep the objects in place (moved by the solar wind, etc.). Although placing a sun reflecting array at the L1 Lagrange point would be expensive and challenging, it is most likely well within our capability. On February 11, 2015, the U.S. National Oceanic and Atmospheric Administration launched the Deep Space Climate Observatory (DSCOVR) satellite which is currently located at the L1 Lagrange point (see NASA Goddard YouTube video below).