Global networks of low cost, three axis, time of flight gravimeters and gradiometers for 3D imaging of the Earth, atmosphere and oceans
Anton Petrov: Evidence of a Donut Like Structure Hidden Inside Planet Earth at https://www.youtube.com/watch?v=GljciCwOfyc Gravitational imaging arrays using low cost but very sensitive gravitational sensors can use time of flight correlation to image regions anywhere inside the earth at high resolution. There are many desktop, even portable alternatives. Atomic clocks, gravity gradiometers, many kinds of
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