Space Exploration.

STS-80, flown by Columbia from 19 November to 7 December 1996, lasted 17 days 15 hours 53 minutes — the longest of all 135 Space Shuttle missions after bad weather delayed its landing. The five-person crew included 61-year-old Story Musgrave.

NASA's Galileo entered orbit around Jupiter on 7 December 1995, the same day its atmospheric probe became the first to plunge into a giant planet's atmosphere. Over almost eight years it found strong evidence for a subsurface ocean on Europa before being deliberately crashed into Jupiter on 21 September 2003.

Russian physician-cosmonaut Valeri Polyakov spent about 437 days 18 hours aboard the Mir space station, launching on 8 January 1994 and landing on 22 March 1995. The mission studied how the human body copes with durations comparable to a trip to Mars, and the record has stood for more than three decades.

NASA's Galileo spacecraft flew past the asteroid 951 Gaspra on 29 October 1991 while en route to Jupiter, making Gaspra the first asteroid ever visited by a spacecraft and returning the first close-up images of an asteroid.

NASA's Voyager 2 passed about 4,950 km above Neptune's north pole on 25 August 1989, discovering the Great Dark Spot, six new moons and active plumes on Triton. It is the only spacecraft to have visited Neptune, completing a 'grand tour' of all four giant planets.

NASA's Voyager 2 flew past Uranus on 24 January 1986 at about 81,500 km from its cloud tops, discovering 10 new moons and two new rings. It remains the only spacecraft ever to visit Uranus.

Space Shuttle mission STS-61-A (Challenger, 30 October – 6 November 1985), the West German Spacelab D-1 mission, carried eight astronauts from launch to landing — the largest crew ever aboard a single spacecraft for a whole flight. It was the only Shuttle flight to launch with eight people.

NASA's International Cometary Explorer (ICE) passed through the plasma tail of comet 21P/Giacobini–Zinner about 7,800 km from the nucleus on 11 September 1985, becoming the first spacecraft to visit a comet — months before the Halley armada.

Soviet cosmonaut Svetlana Savitskaya became the first woman to walk in space on 25 July 1984, spending about 3.5 hours outside the Salyut 7 station testing tools for cutting and welding metal. She was also the first woman to fly in space twice.

On 7 February 1984, during Space Shuttle mission STS-41-B, NASA astronaut Bruce McCandless II used the Manned Maneuvering Unit jetpack to fly up to about 100 m from Challenger — the first untethered spacewalk.

The Soviet Venera 13 lander touched down on Venus on 1 March 1982 and survived for 127 minutes — far beyond its 32-minute design life — returning the first color images of the Venusian surface and analyzing a soil sample before succumbing to about 457 °C heat and 89-bar pressure.

STS-1, flown by John Young and Robert Crippen aboard Space Shuttle Columbia from 12 to 14 April 1981, was the first orbital flight of the Space Shuttle and the first orbital flight of a reusable crewed spacecraft. Columbia completed 36 orbits before landing at Edwards Air Force Base.

NASA's Pioneer 11 made the first spacecraft encounter with Saturn on 1 September 1979, passing about 21,000 km above the cloud tops after a Jupiter flyby in 1974. It returned the first close-up images of the planet and discovered its F ring.

The U.S. Air Force launched Navigation Technology Satellite 2 (part of the program that became GPS) in 1977, with the first dedicated Navstar GPS satellite following in February 1978 — the beginning of the satellite navigation constellation that today underlies navigation, timing, and positioning for billions of devices worldwide, originally developed for military use before being opened to civilian applications.

NASA's Voyager 2, launched on 20 August 1977, and its twin Voyager 1 (launched 5 September 1977) have operated continuously for more than 49 years, the longest of any spacecraft. Both now fly in interstellar space and are managed by JPL, with instruments progressively switched off to conserve declining nuclear power.

Each Voyager probe, launched in 1977, carries a Golden Record — a gold-plated phonograph disc containing images, sounds, music, and greetings in 55 languages, curated by a committee led by Carl Sagan, intended to communicate the story of Earth to any spacefaring civilization that might one day find it. Voyager 1, at roughly 171 AU from Earth as of 2026, carries the farthest-traveled such message ever sent — riding along with the same probe that separately holds the Registry's 'farthest human-made object' record.

The Soviet Venera 9 lander touched down on Venus on 22 October 1975 and returned the first images from the surface of another planet, operating for 53 minutes in temperatures around 485 °C and a pressure about 90 times Earth's.

The Soviet Venera 9 orbiter entered orbit around Venus on 20 October 1975, becoming the first artificial satellite of Venus, while its lander descended to the surface two days later.

The Arecibo message, a 1,679-bit encoded radio transmission designed by Frank Drake and Carl Sagan, was broadcast from the Arecibo Observatory toward the M13 star cluster on November 16, 1974 — the first deliberate, high-powered interstellar message aimed at potential extraterrestrial civilizations, encoding basic information about humanity, DNA, and our solar system in a simple graphic pattern.

NASA's Mariner 10 made the first flyby of Mercury on 29 March 1974. It was also the first spacecraft to visit two planets and the first mission to use a gravity assist from one planet (Venus) to reach another.

The six Apollo landings between 1969 and 1972 returned 382 kg (842 lb) of lunar rocks, core samples, pebbles, sand and dust — far more than the Soviet Luna probes (about 0.3 kg) or China's Chang'e 5 and Chang'e 6 missions (about 1.7 kg and 1.9 kg). The samples are curated at NASA's Johnson Space Center.

Apollo 17 astronauts Eugene Cernan and Harrison Schmitt spent about 75 hours in the Taurus-Littrow valley in December 1972, including three moonwalks totaling about 22 hours. It was the last crewed lunar landing.

NASA's Pioneer 10, launched March 2, 1972, was the first spacecraft placed on a trajectory fast enough to escape the Sun's gravity entirely and leave the solar system — it made the first flyby of Jupiter in 1973 before continuing outward, and its last signal was received in 2003, though it continues silently drifting toward the constellation Taurus.

NASA's Mariner 9 became the first spacecraft to orbit another planet when it entered orbit around Mars on November 14, 1971 — arriving during a global Martian dust storm that initially obscured the surface, it went on to map the entire planet in detail, discovering Olympus Mons (the solar system's largest volcano) and the Valles Marineris canyon system.

The Lunar Roving Vehicle was first driven on the Moon on 31 July 1971 by Apollo 15 astronauts David Scott and James Irwin at Hadley–Apennine. Rovers were also used on Apollo 16 and 17.

NASA's Saturn V placed about 140 tonnes into Earth parking orbit on its heaviest flights (including the Apollo spacecraft and the S-IVB stage), with Apollo 15 in July 1971 among the heaviest. Starship is designed to exceed this when fully operational, but Saturn V's demonstrated figure remains the benchmark.

The Soviet Union launched Salyut 1, the world's first space station, on 19 April 1971. The Soyuz 11 crew of Georgy Dobrovolsky, Vladislav Volkov and Viktor Patsayev lived aboard for 23 days in June 1971 but died during reentry when their capsule depressurized.

The Soviet Venera 7 probe successfully soft-landed on Venus on December 15, 1970, and transmitted data for about 23 minutes before succumbing to the planet's extreme surface temperature and pressure — the first successful landing of a spacecraft on another planet, ahead of the first successful Mars landing (Viking 1, 1976).

The Soviet Lunokhod 1 rover, delivered by Luna 17, rolled onto the Mare Imbrium on 17 November 1970 and was driven from Earth for about 10 months, covering about 10.5 km and returning more than 20,000 images.

The Soviet Luna 16 landed in Mare Fecunditatis in September 1970 and returned 101 grams of lunar soil to Earth on 24 September 1970 — the first sample of another world collected and returned entirely by a robotic spacecraft.

The crew of Apollo 13 — Jim Lovell, Jack Swigert, and Fred Haise — reached a maximum distance of approximately 400,171 km from Earth on April 15, 1970, while looping around the far side of the Moon on their free-return trajectory home after an oxygen tank explosion forced the mission's Moon landing to be aborted — slightly farther than any of the six Apollo missions that actually landed on the Moon, since their damaged spacecraft required a wider swing around the far side.

Neil Armstrong became the first human to walk on the Moon on July 20, 1969, during NASA's Apollo 11 mission, famously describing it as 'one small step for man, one giant leap for mankind' — followed minutes later by Buzz Aldrin, while Michael Collins orbited above in the command module.

Apollo 8, crewed by Frank Borman, Jim Lovell and Bill Anders, entered lunar orbit on 24 December 1968 and completed 10 orbits, making them the first humans to leave Earth orbit, see the far side of the Moon with their own eyes and photograph 'Earthrise'. It was also the first crewed launch of the Saturn V.

The Soviet Venera 4 probe descended into the atmosphere of Venus on 18 October 1967 and transmitted the first direct chemical analysis of another planet's atmosphere, showing it to be mostly carbon dioxide.

The Soviet Luna 10 entered lunar orbit on 3 April 1966, becoming the first spacecraft to orbit the Moon. It studied the lunar gravity field, radiation environment, and infrared emissions.

NASA's Gemini 8 mission, crewed by Neil Armstrong and David Scott, achieved the first successful docking of two spacecraft in orbit on March 16, 1966, connecting with an uncrewed Agena target vehicle — a critical technical milestone for the later Apollo program, which would require docking maneuvers to reach the Moon.

The Soviet Luna 9 lander touched down in the Oceanus Procellarum on 3 February 1966 and transmitted the first photographs from the surface of another world, proving that the lunar surface could support a lander rather than being covered in deep dust.

NASA's Mariner 4 flew past Mars on 14-15 July 1965 at about 9,800 km and returned 21 images — the first close-up photographs of another planet — revealing a cratered, Moon-like surface and a thin atmosphere.

Soviet cosmonaut Alexei Leonov performed the first spacewalk on March 18, 1965, spending about 12 minutes outside his Voskhod 2 spacecraft — his suit inflated in the vacuum of space, nearly preventing him from re-entering the airlock, a near-disaster he resolved by partially depressurizing his suit against procedure.

The Soviet Voskhod 1, launched on 12 October 1964, carried cosmonauts Vladimir Komarov, Konstantin Feoktistov, and Boris Yegorov — the first spaceflight with more than one crew member, and the first flown without spacesuits.

Soviet cosmonaut Valentina Tereshkova became the first woman in space on June 16, 1963, aboard Vostok 6, orbiting Earth 48 times over almost three days — nearly two decades before the second woman, Svetlana Savitskaya, followed her into space in 1982.

NASA's Mariner 2 flew past Venus on 14 December 1962 at about 34,800 km, becoming the first spacecraft to successfully encounter another planet. Its microwave radiometer showed that Venus's surface is extremely hot, overturning hopes of a temperate world beneath the clouds.

Soviet cosmonaut Gherman Titov was 25 years 329 days old when he launched on Vostok 2 on 6 August 1961; he orbited Earth 17 times in about 25 hours, becoming the first person to spend a full day in space and still the youngest person ever to reach orbit.

NASA's TIROS-1, launched on 1 April 1960, was the first operational weather satellite. During its 75-day mission it returned television images of cloud systems, demonstrating that weather could be monitored from orbit.

Soviet spacecraft Luna 3 photographed the far side of the Moon on 7 October 1959, returning images covering about 70% of the hidden hemisphere and revealing it to be far less covered by dark maria than the near side.

The Soviet probe Luna 2 impacted the Moon east of Mare Imbrium on 14 September 1959, becoming the first human-made object to reach another celestial body. Its magnetometer found no significant lunar magnetic field.

The Soviet Luna 1, launched on 2 January 1959, missed the Moon by about 5,900 km and became the first spacecraft to leave Earth's orbit and the first human-made object in heliocentric orbit, earning the nickname 'Artificial Planet 1'.

Project SCORE, launched by the United States on 18 December 1958 atop an Atlas rocket, was the first communications relay satellite. It broadcast a recorded Christmas message from President Dwight D. Eisenhower from orbit.

Laika, a stray dog from Moscow, became the first animal to orbit Earth aboard Sputnik 2 on 3 November 1957, less than a month after Sputnik 1. She died from overheating within hours of launch, as the spacecraft was never designed to return; her flight showed that a living organism could tolerate launch and weightlessness.

Albert II, a rhesus macaque, was launched on V-2 flight No. 47 from New Mexico on 14 June 1949 and became the first primate and first mammal in space, reaching an altitude of about 134 km. He died on impact when the parachute failed.