The Victorians thought space was made of a material which they called the aether. This was later disproved. In the 1940's on the radio, following ideas of the time, Superman fought against strong currents in space and fifties SF had storms in space. More recently, many considered space a vacuum with few atomic particles per cubic centimeter, through which EMR and gravity travels. But the Big Bang idea changed all that. We are told that space is a "something" which can ignore the light speed limit and expand very much faster. It is no longer just the space between matter but exists on it's own and has outstripped the matter and energy expansion of the universe. If it is "something", where does all the new space come from? Or can it miraculously expand forever without changing it's structure/density/whatever, and so remain exactly the same? Even more amazing. Space was always considered to be 100% transparent to all forms of energy and EMR but now we find it is (maybe) 100% opaque to dark energy which acts on it like infra-red radiation on a gas, causing it to expand into ever larger areas. Even stranger, space which many laymen thought of as "nothing" because it is a vacuum, drags along entire galaxies as it expands, so we are told. What is space?