Hon.Fellow,Ceylon College of Physicians,1991International Science Policy Foundation Medal,1992Freeman of Minehead,1992Lord Perry Award for Distance Education,1992Nominated for Nobel Peace Prize,1994University of Liverpool,D.Litt (via satellite) 1995NASA Distinguished Public Service Medal, 1995BIS Space Achievement Medal and Trophy, 1995Mohamed Sahabdeen Award For Science, 1996International Fantasy Award, 1952HUGO (World Science Fiction Convention) 1956,1974,1980NEBULA (SF Writers of America) 1973,1974,1979UNESCO-Kalinga Prize, 1961Aviation Space-Writer's Aaan.Robert Ball Award, 1965AAAS- Westinghouse Science Writing Prize, 1969OSCAR Nomination for 2001 Screenplay (with S. Kubrick) 1969British Interplanetary Society, Hon.FellowAmerican Astronautical Association,Hon. Fellow

World Academy of Art & Science,AcademicianInternational Academy of Art & Science,AcademicianInternational Academy of Astronautics,Hon.Fellow 1960Franklin Inst. Stuart Ballantine Gold Medal 1963Franklin Institute,Fellow 1971Beaver College, Pennsylvania, Hon.D.Sc 1971AIAA Aerospace Communications Award, 1974AIAA Hon. Fellow, 1976Boston Museum of Science, Bradford Washburn Award, 1977King's College, London, Fellow 1977University of Moratuwa, Hon.sc.,1979Academy of Television Arts & Sciences Engineering Award, 1981 Fellow, Institute of Robotics, Carnegie-Mellon, 1981Marconi International Fellowship,1982Hon. Fellow, Instn. of Engineers, Sri Lanka,1983IEEE Centennial Medal, 1984National Academy of Engineering (USA) Foreign Associate 1986Vidya Jyothi Medal (Presidential Science Award) 1986Charles A Lindbergh Award, 1987Third World Academy of Sciences, Associate, Fellow, 1987Society of Satellite Professionals:Hall of Fame, 1987University of Bath,D.Litt., 1988Fellow, Intnl.Aerospace Hall of Fame,S.Diego, Ca., 1989Fellow,Intnl.Space Hall of Fame, Alamagordo,NM 1989

Special Achievement Award, Space Explorers Assn., Riyadh '89R.A.Heinlein Memorial Award, National Space Society, 1990Hon.Life President,U.N.Association of Sri Lanka, 1990 Hon. Fellow, Ceylon College of Physicians,1991 International Science Policy Foundation Medal,1992 Freeman of Minehead,1992  Lord Perry Award for Distance Education,1992 Nominated for Nobel Peace Prize,1994 University of Liverpool,D. Litt (via satellite) 1995 NASA Distinguished Public Service Medal, 1995 BIS Space Achievement Medal and Trophy, 1995 Mohamed Sahabdeen Award For Science, 1996 International Fantasy  Award, 1952 HUGO (World Science Fiction Convention) 1956,1974,1980 NEBULA (SF Writers of America) 1973,1974,1979 UNESCO-Kalinga Prize, 1961 Aviation Space-Writer's Aaan. Robert Ball Award, 1965 AAAS- Westinghouse Science Writing Prize, 1969 OSCAR Nomination for 2001 Screenplay (with S. Kubrick) 1969</PR