Yuri Gagarin launched into space aboard Vostok-1 on April 12, 1961.
Notes on verification
Well-documented historical event confirmed by multiple authoritative sources including NASA, ESA, Britannica, and official mission records. [cascade flags: aggregator_dropped_primary_exists,wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.917 clusters=3 claim_tier=everyday | framework convergence=partial (upstreams: Fédération Aéronautique Internationale (FAI) records, Soviet/Russian space program official mission records, NASA mission archives) — publishers independent, evidence may not be | kind=empirical eligibility=high]
Sources
- How Yuri Gagarin Was Picked to Be First in Space (seed:firsts_and_inventions)
- https://www.planetary.org/space-missions/vostok-1 (corroboration)
- https://www.nasa.gov/image-article/april-1961-first-human-entered-space/ (corroboration)
- https://www.thisdayinaviation.com/12-april-1961/ (corroboration)