174 



Green Bank, WV., U.S.A. 



140-FOOT RADIO TELESCOPE 



National Radio Astronomy Observatory (NRAO) 



"Big Science" Descriptor ; Radio astronomy 



Description of Facility/Instrument : This 140-foot radio telescope has 

 a fully steerable parabolic mirror with receiving equipment. 



Date of Construction ; 1964 



Construction Cost ; Original ; $13.5 million 



1984 $$ ; $41.6 million 



Present International Cooperation 



Nationality(s) of Ownership ; U.S. 

 Nationality(s) of Operational Funding ; U.S. 

 Nationality(s) of Management Staff ; U.S. 

 Nationality(s) of Researchers ; U.S. and foreign 



Potential for Future International Cooperation ; This facility is part 

 of the international Very Long Baseline Interferometry (VLBI) 

 network. 



Socorro, NM., U.S.A. 



NRAO VERY LARGE ARRAY (VLA) 



National Radio Astronomy Observatory (NRAO) 



"Big Science" Descriptor ; Radio astronomy 



Description of Facility/Instrument ; This facility is an aperture syn- 

 thesis radio telescope comprised of 27 antennas with receiving 

 equipment . 



Date of Construction ; 1972-1979 



Construction Cost ; Original ; $78.5 million 



1984 $$ ; $139 million 



Present International Cooperation 



Nationality(s) of Ownership : U.S. 

 Nationality(s) of Operational Funding ; U.S. 

 Nationality(s) of Management Staff : U.S. 

 Nationallty(s) of Researchers ; U.S. 



Potential for Future International Cooperation : This facility con- 

 ducts worldwide Very Long Baseline Interferometry (VLBI) experi- 

 ments. 



