Barnard's Loop is an emission nebula in the constellation of Orion. It is about 1,600 light-years away from Earth. It is part of the Orion complex. It is a semicircular arc that is about 300 light-years across. In the center of Bernard's Loop are two nebula. These are the Orion nebula and the Horsehead nebula. Barnard’s Loop is made up of Plasma. The mainly red color comes from hydrogen gas.