SCIENCE GOALS AND OBJECTIVES: THE OBJECTIVE OF THIS WORK IS TO STUDY THE DIVERSITY OF PHYSICAL AND CHEMICAL PROPERTIES OF MM-CM SIZED COMETARY DUST BOTH THE DIVERSITY OF MATERIALS WITHIN COMETS AND FROM ONE COMET TO THE NEXT. THE PROPOSED WORK STUDIES THE MM-CM SIZED MATERIAL CREATED DURING LATE STAGES OF SOLAR NEBULA ACCRETION WHICH ARE THEN COLLECTED TO MAKE MUCH LARGER BODIES. THIS WORK IS LIKELY TO DEMONSTRATE THAT SUCH MATERIALS GAINED DIFFERENT PHYSICAL AND CHEMICAL PROPERTIES AT DIFFERENT PLACES IN THE SOLAR NEBULA FROM SOLAR NEBULA PROCESSES OR DURING COMET FORMATION. METHODOLOGY: SHORT OF SAMPLE RETURN THE COHESION AND ELEMENTAL COMPOSITIONS OF MM-CM SIZED COMETARY MATTER CAN ONLY BE STUDIED BY METEOR OBSERVATIONS. METEOROID COHESION AND ELEMENTAL COMPOSITIONS CAN BE DERIVED FROM METEOR LIGHTCURVES AND SPECTRA. THE CAMERAS FOR ALLSKY METEOR SURVEILLANCE (CAMS) PROJECT MEASURED OVER 250 000 METEOR LIGHTCURVES AND TRAJECTORIES IN THE PERIOD 2011-2015. THE LIGHTCURVES MEASURED THE MANNER IN WHICH THESE GRAINS FRAGMENT WHILE ENTERING EARTH'S ATMOSPHERE. THE TRAJECTORIES IDENTIFY THE SOURCE: A RANGE OF JUPITER-FAMILY AND OORT-CLOUD COMETS THAT PASS NEAR EARTH'S ORBIT INCLUDING SOME ACTIVE ASTEROIDAL OBJECTS SUCH AS 3200 PHAETHON. AN ASSOCIATED SPECTROSCOPIC SURVEY COLLECTED OVER 1 000 METEOR SPECTRA OF THESE SAME SOURCES WHICH WILL PROVIDE MAIN-ELEMENT ABUNDANCES. THE PROPOSED WORK WILL ANALYZE THIS DATA. THIS WILL REQUIRE NEW MODELS OF METEOROID FRAGMENTATION IN THE ATMOSPHERE AND NEW SOFTWARE TOOLS TO EXTRACT RELEVANT PHYSICAL PARAMETERS FROM THE MEASURED DATA. THE RESULTS WILL BE USED TO INTERPRET THE PROCESSES OF ACCRETION DURING SOLAR SYSTEM FORMATION IN PARTICULARLY ADDRESSING THE QUESTION HOW LARGE DUST MAY HAVE GROWN BEFORE ACCUMULATING INTO COMETS. AS PART OF THIS STUDY IT WILL BE NECESSARY TO STUDY HOW THE DUST EVOLVES SINCE EJECTION FROM THE COMET FROM EXPOSURE TO HEAT AND RADIATION. THE LATTER WILL REQUIRE DYNAMICAL MODELS OF METEOROID STREAM EVOLUTION. RELEVANCE TO THE SOLICITATION: EMERGING WORLDS AIMS TO UNDERSTAND THE FORMATION AND EARLY EVOLUTION OF THE SOLAR SYSTEM INCLUDING THE ACCRETION OF SMALL BODIES AND EARLY THERMAL AND CHEMICAL PROCESSES. WHILE STUDIES OF METEORITES SHOW THAT THE EARLY STAGES OF ACCRETION INCLUDED THE FORMATION OF CHONDRULES IN THE INNER SOLAR NEBULA PROCESSES IN THE OUTER SOLAR NEBULA THAT AFFECT SUCH GRAINS DURING THE FIRST FEW MA OF SOLAR SYSTEM HISTORY REMAIN UNKNOWN.