Yuri Gagarin Becomes the First Person in Space

On the morning of 12 April 1961, Soviet military pilot Yuri Gagarin climbed inside the Vostok 3KA spacecraft at Baikonur Cosmodrome. The Soviet Union had secretly pursued human spaceflight under the Vostok programme, accelerating work after the 1957 launch of Sputnik 1 inaugurated the Cold War Space Race against the United States. Following several uncrewed test missions, Soviet officials formally selected the twenty-seven-year-old Gagarin only days before the flight. Lift-off occurred at 06:07 UTC from Site Number 1, sending the Vostok-K rocket into orbit and making Gagarin the first human being to reach orbital velocity around Earth.

Because medical specialists and engineers could not predict how the human body and mind would react to weightlessness, Gagarin's mission operated under automatic control from the ground. Manual flight systems were locked, though an override code was sealed in an onboard envelope and quietly given to Gagarin in advance. Spacecraft tracking relied mainly on ground stations across Soviet territory, helped by a few telemetry ships in the Gulf of Guinea, so contact was limited for much of the orbit. Due to strict payload limitations, the craft lacked a backup retrorocket. Planners instead stocked about ten days of food and provisions, calculating that natural orbital decay would eventually return the capsule to the atmosphere if the engine failed.