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Mount Wilson Observatory, California, USA, 1916-1918.

Mount Wilson Observatory, California, USA, 1916-1918.
4 0 c m
actual image size: 27cm x 32cm


One of 41 bromide photographic prints related to and showing various stages in the construction of the Hooker 100 inch reflecting telescope at Mount Wilson, California. This view south shows the observatory dome under erection. The observatory was founded in 1904 by the astronomer George Ellery Hale (1868-1938), with funding from the Carnegie Institution. The 100 inch reflecting telescope installed at the observatory in 1917 was the largest telescope in the world at the time, and remained so until the 200 inch reflector at Mount Palomar became operational in 1948. Mount Wilson was at the forefront of astronomy in the first half of the 20th century. Observations by astronomers working there confirmed that the Universe was expanding, as well as leading to substantial advances in understanding of the workings of the Sun.

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© Science Museum / Science & Society Picture Library

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