The Rev. David J. Collins is a Catholic priest, a Jesuit and an associate professor of history at Georgetown University in Washington, D.C., with an interest in science, religion and space. He sometimes teaches a course on outer space, science and religion.

Michael Waltemathe is the chair of practical theology at Ruhr-Universität Bochum in Bochum, Germany. Much of his research focuses on a “religious vision” of space travel and exploration.