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Pyromagnetics, sometimes called thermomagnetics, is the changing of the magnetic properties of a material with temperature. Thermal differences generated in the atmosphere by the sun might provide the energy to establish pyromagnetic oscillations of large plates. The oscillating plates might then be used to compress and/or direct air to propel large, lightweight aircraft or even spaceships. An evaluation of the energy levels involved and the efficiencies of various designs have yet to be completed.