SCIENCE GOALS AND OBJECTIVES. THE GENERAL THEMES ARE TO STUDY NUCLEOSYNTHETIC ISOTOPIC ANOMALIES AND CHRONOLOGY IN COMETARY INTERSTELLAR AND ASTEROIDAL DUST AND ELEMENTAL ABUNDANCES IN SOLAR WIND. MEASUREMENTS OF CHEMICAL AND ISOTOPIC COMPOSITIONS OF SAMPLES RETURNED TO EARTH BY THE STARDUST (1 2) AND GENESIS (3) MISSIONS WILL BE DONE USING THE CHICAGO INSTRUMENT FOR LASER IONIZATION (CHILI) A RESONANCE IONIZATION MASS SPECTROMETER. (1) MUCH IS NOW KNOWN ABOUT THE MINERALOGY AND PETROLOGY OF DUST FROM COMET WILD 2 AND SOME MEASUREMENTS OF O AND MG ISOTOPIC COMPOSITION ARE AVAILABLE. (1) WE PLAN TO IMPROVE KNOWLEDGE OF THE STARDUST COMETARY SAMPLES BY: (A) 26AL-26MG CHRONOLOGY OF AL-RICH