He goes to Palomar Observatory, of course. Scott Kardel, my pal and the guy to whom I turn for all information related to astronomy, is Public Affairs Coordinator for the observatory. He posted a great Super Friends clip over at his Palomar Skies blog. In it, Superman travels to Palomar to make use of their 200-inch mirror.
Scott's blog is a terrific resource of knowledge and photography, so be sure to bookmark it for return visits in the future.