Mount Wilson 100-inch telescope dome

Mount Wilson 100-inch telescope dome

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Caption: 100-inch telescope dome obscured behind trees at night at the Mount Wilson Observatory, California, USA. This optical telescope, called the Hooker telescope after a benefactor, was built in 1918. It was the largest in the world until 1947. Many important advances in astronomy took place here, including Hubble's observation of the redshift of far-away galaxies, explained as their recession in an expanding universe. The telescope was inactive between 1986 and 1994, but has been upgraded and is now used once again for astronomical research. Mount Wilson Observatory, established in 1904, is at an elevation of 1742 metres in the San Gabriel Mountains.

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