8 Astronomical Glass Plates That Made History
More than 200,000 astronomical plates are archived at the main offices of the Carnegie Observatories, in Pasadena, Ca. Made between 1892 and the early 1990s using telescopes at Mount Wilson, Palomar (near San Diego), and Las Campanas (in Chile) observatories, the plates range in size from centimeter-square slivers to pieces as large as a desktop computer screen. They include some of the most important observations in astronomy in the last century.
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