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You confuse the study of gravity with the phenomenon of gravity. What questions are worth asking is certainly a socially negotiated issue. But the phenomenon exists independently of the observer. The question of whether a falling tree makes a sound in the forest if there is nothing to hear is indeed quite analogous, and has a clear answer: it depends on what you mean by "sound". If "sound" is a particular set of compressions and rarefactions in the ambient air, then the answer is clearly yes. For other definitions of "sound", the answer is not so clear. herb lin P.S. While I am glad to argue this point here, maybe this list isn't the appropriate place to do it. HLIN@NAS *************