Mount Wilson Observatory
…Mount Wilson was an enormous task. First light was December 13, 1908. It was, at the time, the largest operational telescope in the world. Lord Rosse's Leviathan of Parsonstown, a 72-inch (1.8-meter) telescope built in 1845, was, by the 1890s, out of commission. Although slightly smaller than the Leviathan, the 60-inch had…