NASA SP-500 



EXOBIOLOGY IN 

 EARTH ORBIT 



The Results of Science Workshops Held 

 at NASA Ames Research Center 



Edited by 



D. Def rees, D. Brownlee, J. Tarter, 

 D.'Osher, W. Irvine, and H. Klein 



•Z?3£ 



Prepared at Ames Research Center 



-^ 



* 



NASA 



National Aeronautics and Space Administration 

 Office of Management 

 Scientific and Technical Information Division 

 Washington. DC 1989 



