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> But if you think you are measuring features of the aether then it looks > like Voodoo Science (to borrow Robert Park's useful term) Tom - if you are any doubt about the reality of space you should read The shape of space by Graham Nerlich for a simple and cogent defence of realism . Publisher: Cambridge ; New York : Cambridge University Press, C1994. . ISBN: 0521450144 0521456452 You don't have to propose the existence of an aether to talk about space as real. In fact the aether is proposed by those who cannot allow the reality of space itself and want to propose that there must be 'something' there. After Einstein this pretty much ceases to be a discussion. Space is real and has shape as required by the general theory of relativity. But this is not an aether... Alan