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" ... The gravitational ripples in the fabric of space are a little bit like that: the ripples move at the speed they always move at through the medium -- at the speed of light, c -- but sometimes the medium itself moves. That doesn't mean it's breaking the speed of light any more than photons do when they wind up 46 billion light years from where they started after just 13.8 billion years; gravitational waves are doing exactly what they're supposed to do. The analogy of a compression followed by a rarefaction is actually a very, very good one, mind you; a passing wave will distort the fabric of space (and all the items/particles in it) by stretching and compressing them in a very particular fashion. ... "