SCP-179 has been defined as a human female of undetermined ethnic group of between twenty and forty years of age. Its entire bodily surface is covered in or composed of a matte black material. Its hair appears to be composed of this material, measures over 34 km long and is constantly pushed away by solar wind. However, this part of SCP-179 seems to reflect variable amounts of sunlight — this reflection being the phenomenon that indicated its existence to Foundation astrophysicists during 1940.