The literary genre of science fiction is diverse and since there is little consensus of definition among scholars or devotees, its origin is an open question. Some offer works like the Sumerian Epic of Gilgamesh as the primal texts of science fiction. Others argue that science fiction began in the late Middle Ages, or that science fiction became possible only with the Scientific Revolution, notably discoveries by Galileo and Newton in astronomy, physics and mathematics. Some place the origin with the gothic novel, particularly Mary Shelley's Frankenstein.