The Adler Planetarium is a public museum dedicated to the study of astronomy and astrophysics. The Adler is America's first planetarium and part of Chicago's Museum Campus, which includes the John G. Shedd Aquarium and The Field Museum. It opened to the public on May 12, 1930 and was declared a National Historic Landmark in 1987. The Adler is home to three full size theaters, extensive space science exhibitions, and a significant collection of antique scientific instruments and print materials. In addition, the Adler boasts the Doane Observatory, one of the only research-active, public urban observatories.