This 3 day mission saw two crewmembers set the still-standing world record for highest Earth orbit (1,373 km) of a human-carrying spacecraft, performed the first-ever direct-ascent (single orbit) rendezvous, succeeded in producing the first (very small amount of) artificial gravity on a human spaceflight, and performed two spacewalks. The direct-ascent rendezvous proved that rapid launch-to-docking, which would be needed for the Apollo lunar program, was possible and not too tiring on the crew. To create artificial gravity, a tether was connected between the Gemini capsule and its Agena target vehicle and the two craft spun around each other. The flight ended with the first completely computer-controlled reentry by a U.S. human spacecraft.