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CHAPTER V - IN SITU INVESTIGATIONS 89 



5.1 Models of Interstellar Grains 89 



5.2 Reactions of Neutral Atomic Oxygen 92 



5.3 An Artificial Comet 93 



5.4 Microbial Survival in Space 96 



CHAPTER VI -SUMMARY OF PROPOSED EXPERIMENTS 101 



6.1 Observational Exobiology 101 



6.2 Cosmic Dust Collection 107 



6.3 In Situ Investigations 109 



APPENDIX A - ACRONYMS AND ABBREVIATIONS 111 



APPENDIX B- CHARACTERISTICS OF ORBITAL OBSERVATORIES . 113 



APPENDIX C - CONVERSIONS: WAVELENGTH/FREQUENCY 123 



APPENDIX D CONVERSIONS: LINEAR SIZE/ANGULAR SIZE 125 



IV 



