The telescope housed inside it — the Hooker 100-inch telescope — was completed in 1917 and reigned as the world’s largest optical telescope until 1949.

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With a 100-inch (2.5-meter) diameter mirror for collecting light, the Hooker telescope at Mount Wilson was the largest telescope at the time.

Designed by George Ellery Hale, the Hooker telescope at Mount Wilson Observatory used a 100-inch diameter mirror, making it the largest telescope in the world at the time.

If your telescope magnifies the light from a 2-inch telescope 100 times, it would spread the light of the stars too thin and you’d see a dim, blurry mess.

At the of age 30, he arrived at Mount Wilson Observatory in Southern California just in time to use the new Hooker 100-inch telescope, at the time the largest in the world.

The telescope housed inside it — the Hooker 100-inch telescope — was completed in 1917 and reigned as the world's largest optical telescope until 1949.

With a 100-inch (2.5-meter) diameter mirror for collecting light, the Hooker telescope at Mount Wilson was the largest telescope at the time.