Gemini 5, manned with two astronauts, was the third earth-orbiting spacecraft of the Gemini series. The cone-shaped spacecraft was 3.05 m in diameter at the largest end, which was the rear of ... the craft. The major objectives of this mission were to demonstrate (1) a long-duration manned flight using a fuel cell power system, (2) rendezvous capabilities, and (3) rendezvous maneuvers. scientific studies included zodiacal light, synoptic terrain, synoptic weather photography, and a cloud top spectrometer experiment. In addition, five medical and seven technological experiments were performed during the mission. The 120-orbit flight lasted 8 days, returning to earth on august 29, 1965. The mission was considered successful.