Nadir view of the U.S. Laboratory / Destiny, Functional Cargo Block (FGB) / Zarya, Node 1 / Unity and Pressurized Mating Adapter 3 (PMA3) taken during the initial approach of Endeavour, Orbiter Vehicle (OV) 105, during the STS-100 mission. The P6 Truss' starboard Early External Thermal Control System (EETCS) radiator is also visible.