Mars Odyssey, launched on April 7, 2001, had been successfully conducting its mission, including the determination of the elemental composition of the surface of Mars and understanding of water ice distributions on Mars. Mars Odyssey Gamma?Ray Spectrometer (GRS) Suite has confirmed the presence of water ice at the north and south poles as well as fairly high hydrogen concentrations for parts of the equatorial regions. Mars Odyssey GRS results provided elemental maps of Mars and new findings of Mars including confirmation of an ancient ocean on Mars.
SELENE?1 (KAGUYA) mission is known to be one of the most successful orbital missions in history. Recently KAGUYA GRS team published radioactive maps of the Moon, and other elemental maps are under investigation at present. Understanding lunar surface using GRS is important with respect to both unravel geological history of the Moon and obtain elemental maps of lunar surface regions. New era of lunar exploration after the Apollo programs has started already by several countries. KAGUYA GRS team is planning on its next challenging task on SELENE?2 Rover with a gamma?ray?neutron?X?ray (GNX) system for new surface investigation of the Moon. This presentation demonstrates a summary of Mars Odyssey GRS results, current status of KAGUYA GRS data analysis.