The National Air and Space Museum's (NASM) Explore the Universe exhibit shows how ideas about the Universe evolved as new astronomical instruments were developed. It presents the Universe as discerned by the naked eye, then shows how the telescope, photography, spectroscopy, and digital technology revolutionized our view. The largest section describes what astronomers today think about the nature of the Universe. As part of this exhibit, curator Dr. David DeVorkin, collected astronomical observatory postcards from the public. Some of the postcards were featured in the exhibit as well as the associated NASM website.