The first came into existence with the undulatory theory of light,and was dealt with by Fresnel and Dr.Thomas Young;it involved the question,how could the earth move through an elastic solid,such as essentially is the luminiferous ether? Michelson Morley• The first came into existence with the undulatory theory of light, and was dealt with by Fresnel and Dr. Thomas Young; it involved the question, how could the earth move through an elastic solid, such as essentially is the luminiferous ether? Michelson Morley