Gemini XI was the ninth, not the eleventh, NASA Gemini mission. Astronauts Pete Conrad and Dick Gordon, both U.S. Navy veterans, took off from Cape Kennedy aboard a Titan rocket in September 1966. Only an hour and a half after liftoff, they docked the Gemini XI capsule with the Agena target vehicle, simulating the docking between the Apollo capsule and lunar lander during the later missions to the moon, and orbited as high as 740 miles above the Earth. While the two ships were tethered together in space, the astronauts spun them around a shared barycenter, creating mild artificial gravity with the centrifugal force. Dick Gordon later opened the hatch, stuck his head and arms out of the capsule, and took some excellent pictures of the Earth with his Hasselblad camera. After the Gemini XI capsule returned to Earth, it was put on display at the California Science Center in Los Angeles.