Abell 370 is a galaxy cluster located nearly 5 billion light-years away from the Earth (at redshiftz = 0.375), in the constellation Cetus.[3] Its core is made up of several hundred galaxies. It was catalogued by George Abell, and is the most distant of the clusters he catalogued.
Abell 370 appears to include several arcs of light, including the largest ever discovered with 30" long. It was originally referred to as the Giant Arc, but later renamed to the Dragon Arc.[7] These arcs or deformations are mirages caused by gravitational lensing of distant galaxies by the massive galaxy cluster located between the observer and the magnified galaxies.[3][8] This cluster shows an apparent magnitude of +22.
In 2002, astronomers used this lensing effect to discover a galaxy, HCM-6A, 12.8 billion light years away from Earth. At the time it was the furthest known galaxy.[9]
In 2009, and HST study in the field of Abell 370 revealed in greater detail the 30" long arc with the appearance of a dragon, and hence rebranded as The Dragon[10] by NASA scientists.[11] Its head is composed of a spiral galaxy,[12] with another image of the spiral composing the tail. Several other images form the body of the dragon, all overlapping.[13] These galaxies all lie approximately 5 billion light years away.