深宇宙のリモートセンシングの展開

抄録

Inspired by Apollo projects, spacecraft explorations to various planetary bodies started. Those targets included not only inner planets but also outer planets and their satellites. Planetary remote sensing is different from that for the Earth in some points. Planetary surface is covered with regolith, fine soil-like fragments from impact ejecta. The regolith surfaces of airless bodies suffer from so-called space weathering. It is difficult to obtain ground truth data on planetary explorations. Several works on planetary geology are introduced : ancient fluidal activities on Mars and its relation with ancient climate, stress history on Venus' surface from dike orientations, spectroscopic studies of lunar mare, surface of icy satellites, and surface of asteroid Eros. A couple of innovative methods, global radar soundings and ultraviolet spectroscopy, are introduced.