what is the great rift
In astronomy, the Great Rift (sometimes called the Dark Rift, or, less commonly, Dark River) is a series of overlapping, non-luminous, molecular dust clouds that are located between the Solar System and the Sagittarius Arm of the Milky Way Galaxy at a distance of about 100 parsecs or about 300 light years (2Ã10 15 miles or 3Ã10 15 kilometers) from Earth.