ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Palomar sky survey preparation. Astronomers Wilhelm Baade (1893-1960, right) and A. G. Wilson inspecting test plates prior to the start of the first Palomar Sky Survey (POSS I). The survey was carried out between 1950 and 1957, using the Oschin Schmidt Telescope at the Palomar Observatory, California, USA.
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