
Prototype beam splitter for the Advanced Laser Interferometer Gravitational Wave Observatory (aLIGO)
2008 (prototype)
2008 (prototype)
1980
1980
1964
1986
1986
1986
1972
1990-1993 (spare); 1995 (original launched)
1986
1986
1982
1953-1968
1980
1980