PHOTO: Electing a new pope

Cardinal Francis Arinze, 80, of Nigeria exits St. Peter's Basilica after he attended the mass before he and the other cardinals will enter the conclave to decide who the next pope will be. Cardinals are set to enter the conclave to elect a successor to Pope Benedict XVI after he became the first pope in 600 years to resign from the role. The conclave is scheduled to start Tuesday inside the Sistine Chapel and will be attended by 115 cardinals as they vote to select the 266th Pope of the Catholic Church. (Spencer Platt/Getty Images)

MORE: Follow our live coverage of the papal conclave