Mount Stromlo Observatory
The MACHO project found the first example of the gravitational lensing of one star by another, known as Gravitational microlensing, in 1993 (Alcock et al. 1993; Paczynski 1996). This discovery was made by repeated imaging of the Magellanic Clouds with the 50-inch Great Melbourne Telescope using a mosaic of 8 2048 by 2048 pixel CCDs. The camera was made by the Centre for Particle Astrophysics in California (CFPA). At the time it was the largest digital camera ever built (Frame & Faulkner 2003). Between July 1992 and December 1999, the MACHO project made over 200 billion stellar measurements. The data was studied at the observatory and at the Lawrence Livermore National Laboratory.