Designed by Ernest A. Grunsfeld, Junior in 1930 the Adler Planetarium and Astronomy Museum was the first planetarium in the western hemisphere. Two planetarium theaters, exhibit galleries featuring space exploration and space science, and on of the largest collections of historic astronomical instruments in the world help the Adler fulfill its mission to "inspire the next generation of explorers".The Doane Observatory at the Adler Planetarium & Astronomy Museum is home to the largest aperture telescope available to the public in the Chicagoland area. As such, it is the centerpiece of all telescope observing experiences at the Adler. With its 20-inch (0.5 m) diameter mirror, the Doane can gather over 5000 times more light than an unaided human eye. Out front is a bronze sculpture of a sundial named "Man Enters the Cosmos" by Henry Moore.