 The areas of the cluster that appear green are mainly composed of gas, while the parts that seem to be red are made of dust.The DR 6 nebula is located about 3,900 light-years away in the constellation Cygnus.The center of the nebula, where the ten stars are located, is roughly 3.5 light-years long, roughly equivalent to the distance between our Sun and Alpha Centauri, the closest star to the Sun.