See the first image of a black hole, our solar system and beyond
Presidential hopeful Barack Obama has embarked on a weeklong tour of the Middle East and Europe designed to deepen his foreign policy credentials, confront questions at home about his readiness to be commander in chief and signal the possibility of a new era in U.S. relations with the rest of the world.
Obama leaves the gym after talking to service members at Camp Arifjan, Kuwait, on Friday. Sgt. Jarod Perkioniemi/AP