THIS PROPOSAL IS FOCUSED ON QUESTIONS TO BE ANSWERED BY MICROANALYSIS OF RETURNED COMET DUST FROM THE STARDUST MISSION AND RETURNED ASTEROID DUST FROM THE HAYABUSA MISSION. HERE WE PROVIDE BACKGROUND ON UNRESOLVED QUESTIONS FOR EACH. THE PROPOSED STARDUST SAMPLE RESEARCH IS SIGNIFICANT BECAUSE IT WILL PROVIDE A) NEW INFORMATION ON THE COMET PARTICLES IN UNEXPLORED STARDUST TRACKS; B) IMPROVED CONTEXT FOR INTERPRETING FINE-GRAINED AND AMORPHOUS MATERIAL AMONG THE COMET 81P/WILD 2 SAMPLES WHICH HAVE BEEN VARIABLY INTERPRETED AS INDIGENOUS AND IMPACT CAPTURE-GENERATED; AND C) A POSSIBLE NEW MEANS OF IDENTIFYING SURVIVING GEMS IN STARDUST IMPACT TRACKS WHICH IS VERY IMPORTANT TO CLARIFYING THE MIXING OF INNER AND OUTER SOLAR SYSTEM MATERIALS IN KUIPER BELT COMETS AND TO ADDRESSING THE ORIGINS OF THE PARENT BODIES OF GEMS-RICH INTERPLANETARY DUST. THE PROPOSED HAYABUSA SAMPLE RESEARCH IS SIGNIFICANT BECAUSE IT WILL PROVIDE A) A MEANS OF ASSESSING THE PROPOSED DOMINANCE OF SOLAR WIND IRRADIATION IN SPACE WEATHERING OF ASTEROID ITOKAWA; B) A DATABASE OF LABORATORY-IRRADIATED SILICATE RIM STRUCTURES AND ELEMENTAL PROFILES; AND C) A COMPREHENSIVE UNDERSTANDING OF THE MINERAL-SPECIFIC EFFECTS OF SOLAR-WIND DOMINATED SPACE WEATHERING OF SILICEOUS ASTEROIDS THAT WILL FORM A FOUNDATION FOR INTERPRETING SPACE WEATHERING OBSERVED ON OTHER LOW-GRAVITY AIRLESS BODIES TARGETED BY CURRENT AND FUTURE SPACE MISSIONS (JAXA S HAYABUSA 2 AND NASA S OSIRIS-REX FOR EXAMPLE) THAT ARE EXPECTED TO CONTAIN CARBONACEOUS IN ADDITION TO SILICEOUS MATERIAL.