Abstract
The paper reviews investigations on structure and composition of planets which are related to properties of planetary material at high pressures and temperatures. We list important observations that contain information on the interior of a planet and sketch some theoretical methods of high-pressure physics. Planetary matter may be devided into three groups: gases, ices, and rocky material. We discuss the state of these materials at thermodynamical conditions relevant for the interior of planets. Such states include phenomena as solid-solid phase transitions, melting, metallization, critical points, miscibility, and convection. Remarks are given on the importance of high-pressure investigations for problems in planetary cosmogony.
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