01 / Longest single human spaceflight
437
days · approximatelyValeri Polyakov’s continuous stay aboard Mir, January 1994 to March 1995. This is a single-flight record, not cumulative time in space.
Original sourceSource review / 2026-09-26How far can we go?.
Endurance, distance, speed, and a different kind of first. Sourced records with explicit definitions.
02 / First spacecraft in interstellar space
2012
heliopause crossingVoyager 1 crossed the heliopause in August 2012. Crossing this boundary is different from leaving the gravitational reach of the Sun.
Original sourceSource review / 2026-09-2603 / First probe to visit all four giant planets
04
giant planetsVoyager 2 encountered Jupiter, Saturn, Uranus, and Neptune between 1979 and 1989.
Original sourceSource review / 2026-09-2604 / First powered flight on another planet
39.1
secondsIngenuity’s first flight on Mars on April 19, 2021 demonstrated powered, controlled flight in the thin Martian atmosphere.
Original sourceSource review / 2026-09-26These are dated reference records, not live rankings.