The ether conceived in the 19th century probably does not exist. But empty space is most likely a medium. A medium that does not interact with anything we know of yet, not even light. This medium is more evasive than neutrino, which has a mass. Experiments using light to prove or disprove existence of this medium will always fail. Only things that interact with space medium are fields, electric/magnetic/gravitational fields. Inverse square laws are an indication.During the 19th century, it was proposed that light travels through vacuum in the presence of a pseudo medium known as ether. But does it really exist? Is there any evidence whether it exists or not?