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Apollo 16
Apollo 16 was the fifth crewed Moon landing of NASA's Apollo program, launched in April 1972 and the only mission to land in the central lunar highlands at Descartes.
Apollo 17
Apollo 17, the sixth and final Apollo lunar landing mission, carried Eugene Cernan, Ronald Evans, and Harrison Schmitt to the Taurus-Littrow valley in December 1972.
Apollo 4
Apollo 4 was the first uncrewed flight test of the three-stage Saturn V rocket and the first launch from Kennedy Space Center, lifted off on November 9, 1967.
Apollo 5
Apollo 5, an uncrewed NASA mission launched on January 22, 1968, carried out the first test flight of the Apollo Lunar Module, verifying its propulsion systems and staging, and was deemed a complete success.
Apollo 6
Apollo 6 was an uncrewed NASA test flight launched on April 4, 1968, the second test of the Saturn V rocket and the final uncrewed qualification before crewed Apollo missions.
Apollo 7
Apollo 7, also called Apollo VII, was the first crewed Apollo flight, an 11-day Earth-orbit test in October 1968 flown by Wally Schirra, Donn Eisele, and Walt Cunningham.
Apollo 8
Apollo 8, NASA's 1968 mission crewed by Frank Borman, James Lovell, and William Anders, was the first to send humans out of Earth orbit and around the Moon.
Apollo 9
Apollo 9, or Apollo IX, was the third crewed Apollo mission and first crewed Lunar Module flight, launched in March 1969 to test lunar landing procedures in Earth orbit.
Apollo command and service module
The Apollo command and service module (CSM) was a two-module crewed spacecraft built by North American Aviation, flying 23 missions, 15 crewed, including all lunar landings from 1968 to 1975.
Apollo Guidance Computer
The Apollo Guidance Computer was NASA's digital computer providing guidance, navigation, and control for Apollo spacecraft, flying on every crewed mission from Apollo 8 through Apollo 17.
Apollo Lunar Module
The Apollo Lunar Module, originally the Lunar Excursion Module (LEM), was Grumman's two-stage lander that carried 12 astronauts to the Moon from 1969 to 1972.
Apollo program
The Apollo program, also known as Project Apollo, was NASA's human spaceflight program that landed astronauts on the Moon between 1969 and 1972, fulfilling President Kennedy's 1961 goal.
Apollo–Soyuz Test Project
The Apollo–Soyuz Test Project (ASTP) was the first international crewed spaceflight, in July 1975, when an American Apollo docked with a Soviet Soyuz; it ended the Apollo program.
Apple Maps
Apple Maps is a web mapping service developed by Apple that provides navigation, transit directions, and street-level imagery on Apple devices and, since 2024, in a web browser.
Approach and Landing Tests
The Approach and Landing Tests were 1977 NASA flight tests in which the Space Shuttle prototype Enterprise was released from a Boeing 747 to glide to a landing.
APT Satellite Holdings
APT Satellite Holdings is a Hong Kong-listed satellite operator, established in 1992, whose APSTAR fleet serves broadcasters and telecom customers across Asia, Europe, Africa, and Oceania.
Aqua (satellite)
Aqua, originally named EOS PM-1, is a NASA Earth science satellite launched in 2002 to study evaporation, clouds, precipitation, sea ice, and the water cycle.
Aquanaut
An aquanaut is a person who lives and works underwater for extended periods by saturation diving from an underwater habitat, including Navy divers, marine scientists, and astronauts training in NASA's NEEMO missions.
Arabsat
Arabsat (عربسات), formally the Arab Satellite Communications Organization, is an intergovernmental satellite operator established in 1976 by 21 Arab League states and headquartered in Riyadh, Saudi Arabia.
Arase
Arase, also known as ERG, is a JAXA satellite launched in 2016 to study how electrons in the Van Allen radiation belts are accelerated and lost.
Arcas (rocket)
Arcas was an American single-stage solid-propellant sounding rocket developed by Atlantic Research for the Office of Naval Research, lifting small payloads to about 64 km at low cost.
Arcjet thruster
An arcjet thruster is an electrothermal rocket engine that heats a gaseous propellant with an electrical arc before nozzle expansion, first flown operationally on Telstar 401 in 1993.
Ares I
Ares I was a two-stage NASA rocket developed from 2005 through 2011 to launch the Orion crew vehicle to Earth orbit as part of the Constellation Program.
Ares I-X
Ares I-X was an uncrewed NASA flight test vehicle launched from Kennedy Space Center on October 28, 2009, meeting all objectives for the Ares I rocket.
Ares V
Ares V (CaLV, Ares 5) was NASA's heavy-lift cargo launch vehicle for the Constellation program, designed to carry the lunar lander and Earth departure stage.
Ariane (rocket family)
Ariane is a family of European expendable launch rockets developed for the European Space Agency and flown from Kourou, French Guiana, since 1979 to give Europe independent access to space.
Ariane 4
Ariane 4 was a European expendable launch vehicle, operated by Arianespace from 1988 to 2003, which flew 116 missions and carried more than 180 satellites into orbit.
Ariane 5
Ariane 5, also known as Ariane V, was a European heavy-lift expendable rocket operated by Arianespace from Kourou, French Guiana, which launched the James Webb Space Telescope before its retirement in 2023.
Ariane 6
Ariane 6 is a European expendable heavy-lift launch vehicle developed by the European Space Agency and operated by Arianespace from Kourou, French Guiana, first flown in July 2024.
Arianespace
Arianespace is a French launch services company created in 1980 as the world's first commercial space transportation company, operating Ariane rockets from Kourou, French Guiana.