I'm afraid I don't know the answer to these questions, but I thought they were interesting. (The topic came up in a different thread, I thought I'd start a new thead rather than hijack the old). Suppose we have a 1 watt/m^2 beam of gravitaitonal radiation. 1) Where would be the first (lowest frequency) "absorption peak" of this radiation if it passed through the Earth? (I'm guessing that it would be where 1 wavelength = radius or diameter of th Earth) 2) How much power would the Earth absorb from such a beam? (This may depend on polarization, we are ideally looking for the "best match" to get optimum power transfer, but anything that is easy to calculate will do if it's the right order of magnitude). 3) Is the question properly posed so that it has an answer? (Is there any problem with defining the energy content of gravitational radiation as x joules/m^3 using pseudotensors, for instance - or is there a problem converting joules/m^3 to watts/m^2 - or is there any other conceptual problem with the question?).