Vatican Observatory astronomer Christopher Corbally, S.J., (lower level) and visiting scholar Aileen O'Donoghue (upper level) admire the beauty and serenity of the 10 September sunset before beginning their night's observing run at the University of Arizona's Bok Telescope on Kitt Peak outside of Tucson. Horrific events transpiring the next morning on the other side of the continent would change the United States and the world forever. (Photo by David Harvey)