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2 PRIMARY Sci; 2 EXPL [[underline]] SOLAR SYSTEM [[/underline]] NASA TRADITION { PRIMATIVE [[PRIMITIVE]](COMETS) 3 CLASSES of OBJECTS { OTHER { INNER INITIATIVE: MAJOR MISSION TO EACH CLASS of OBJECTS in 1990's STRATEGY DEVELOPED BY SSEC of NAC ① CRAF (~1993) ASTEROID BELT & COMET (BEST PRESERVED SAMPLES OF S.S., ∴ SS EVOLUTION) ② CASSINI (~1998 → 2005) S/C TO SATURN & TITAN (ORBITER & 3 PROBES) STRUCTURE & COMPOSITION of GAS GIANT PLANET ③ MRSR (CENTERPIECE) ROBOTIC ~1996: BRING BACK SAMPLES of MARS [[underline]] EARTH [[/underline]] STUDY FORCES THAT SHAPE & AFFECT ENVIRONMENT, HOW ENV. IS CHANGING, HOW CHANGES AFFECT VS GOAL: COMPREHENSIVE UNDERSTANDING of EARTH AS SYS. - HOW COMPONENTS FUNCTION HOW SYS INTERACT @ EVOLVES SPACE: ABILITY TO MAKE GLOBAL OBSERVATIONS (TECH FOR 1ST TIME) - PHYSICAL PROCESSES CONNECT OCEANS, ATM, BIO. INCLUDES: - EXP & FREE - FLYING PLATFORMS in POLAR; LEO LOW INC. ; GEO.... [[left margin]] INT'L PGM & INVOLVE SEVERAL US AGENCIES{ [[/left margin]] THAT WOULD MAKE INTEGRATED, LONG TERM MEAS. - DATA SYS TO INTEGRATE & MODEL