The Persistence of Ether

What is space: an empty stage, where the physical world of matter acts out its drama; an equal participant, that both provides background and has a life of its own; or the primary reality, of which matter is a secondary manifestation? Views on this question have evolved, and several times changed radically, over the history of science. Today, the third view is triumphant. After a brief tour in the history of ideas, I’ll discuss the evidence for our modern ether, its strange properties, and some new ideas about it (including a better name).