CHRIS COOK / SCIENCE PHOTO LIBRARY CHRIS COOK / SCIENCE PHOTO LIBRARY
Mount Wilson 60-inch telescope dome interior and astronomers, time-exposure image. This optical telescope was the largest in the world when it was built in 1908 at the Mount Wilson Observatory, California, USA, by George Ellery Hale. Many important observations were made using this telescope, including observations that some of the objects called "nebulae" were in fact made up of star-like condensations. The "nebulae" were what are now called galaxies. The telescope has been upgraded and is still in use. Mount Wilson Observatory was established in 1904. It is at an elevation of 1742 metres in the San Gabriel Mountains.
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