From Martin Selbrede's article
http://www.geocentricity.com/rebuttal.htm

"In short, "empty" space is not a vacuum; it is not a "nothing," it is a "something." Correspondingly, it has properties and attributes that "nothingness" cannot possess. Dr. Robert J. Moon, Professor Emeritus in Physics at the University of Chicago, published an article in 21st Century, May-June, 1988, pg. 26ff, entitled "Space Must Be Quantized," addressing precisely this issue. He points out that "according to accepted theory, free space is a vacuum. If this is so, how can it exhibit impedance? But it does. The answer, of course, is that there is no such thing as a vacuum, and what we call free space has a structure. ...This impedance equals 376+ ohms." This reactive, energy-storing impedance is a natural corollary of geocentric theory and its ultradense firmament; it has not been accounted for by conventional science, and is not contained within either Newton's dynamics or Einstein's gravitational field equations."