1,868 articles
Stratolaunch Systems
Stratolaunch Systems is an American aerospace company founded by Paul Allen in 2011 at Mojave, California, which built the Roc and now flies reusable hypersonic Talon-A testbeds.
Strela (rocket)
Strela, Russian for "Arrow," is a Russian space launch vehicle made by converting the UR-100NUTTKh ICBM, developed by NPO Mashinostroyeniya and flown three times from Baikonur silos.
STS-1
STS-1 was the first orbital flight of NASA's Space Shuttle program, launched on April 12, 1981, with the orbiter Columbia carrying commander John Young and pilot Robert Crippen.
STS-107
STS-107 was the 113th Space Shuttle mission and the 28th and final flight of Columbia, a 16-day microgravity and Earth science research mission.
STS-115
STS-115, designated ISS-12A, was a Space Shuttle mission flown by Atlantis from September 9 to 21, 2006, delivering the P3/P4 truss to the International Space Station.
STS-121
STS-121 was a 2006 NASA Space Shuttle mission flown by Discovery to the International Space Station, the second return-to-flight test mission after the 2003 Columbia accident.
STS-125
STS-125, also designated Servicing Mission 4, was a 2009 Space Shuttle mission flown by Atlantis to service the Hubble Space Telescope, the fifth and final astronaut visit.
STS-135
STS-135 was the 135th and final Space Shuttle mission, flown by Atlantis in July 2011 to deliver more than 9,400 pounds of supplies to the International Space Station.
STS-27
STS-27 was a classified Department of Defense Space Shuttle mission flown by Atlantis in December 1988, deploying a reconnaissance satellite reported as the first Lacrosse radar-imaging spacecraft.
STS-31
STS-31 was the 35th mission of NASA's Space Shuttle program, flown by Discovery from April 24 to 29, 1990, to deploy the Hubble Space Telescope into the highest Shuttle orbit to date.
STS-4
STS-4 was the fourth and final orbital flight test mission of NASA's Space Shuttle program, flown by Columbia from June 27 to July 4, 1982.
STS-51-B
STS-51-B was the 17th flight of NASA's Space Shuttle Program and the seventh flight of Challenger, launched on April 29, 1985, carrying the Spacelab-3 laboratory for microgravity research.
STS-51-F
STS-51-F was a 1985 Space Shuttle mission, the 19th in the program and Challenger's eighth flight, which carried the Spacelab 2 laboratory and flew the program's only Abort To Orbit.
STS-51-L
STS-51-L was the 25th Space Shuttle mission and the tenth flight of Challenger, which broke apart 73 seconds after liftoff on January 28, 1986, killing all seven crew members.
Student and amateur satellites
Student and amateur satellites are spacecraft built for education and hobby radio rather than profit, mostly CubeSats; amateur-radio satellites traditionally bear the OSCAR name, begun with OSCAR-1 in 1961.
Submillimeter Wave Astronomy Satellite
The Submillimeter Wave Astronomy Satellite, or SWAS, was a NASA Small Explorer space telescope launched in 1998 to measure water vapor and molecular oxygen in interstellar clouds.
Suisei
Suisei (すいせい, "comet") was a Japanese space probe built by ISAS and launched in 1985 to observe Halley's Comet, imaging its hydrogen cloud and measuring a rotation period of about 52 hours.
Sun sensor
A sun sensor is a spacecraft attitude sensor that measures the Sun's direction in the spacecraft's body frame, providing the Sun vector used for attitude determination, safe-mode recovery, and fault detection.
Sunita Williams
Sunita "Suni" Williams is a retired NASA astronaut and U.S. Navy captain who logged 608 days in space over three missions and holds the women's spacewalking record.
Super heavy-lift launch vehicle
A super heavy-lift launch vehicle is a rocket able to place more than roughly 25 to 40 metric tons of payload into low Earth orbit.
SUPERball
SUPERball is a spherical tensegrity robot prototype developed at NASA Ames Research Center as an untethered landing and rolling rover for planetary missions, notably to Titan.
SuperCam
SuperCam is a remote-sensing instrument on NASA's Perseverance rover, landed in Jezero Crater in 2021, that analyzes Martian rocks from a distance with laser spectroscopy, imaging, and a microphone.
Supersonic retropropulsion
Supersonic retropropulsion is an entry, descent, and landing technology that fires retrorockets against supersonic airflow to slow a spacecraft, a candidate for landing large payloads on Mars.
Supersynchronous orbit
A supersynchronous orbit, or supersynchronous transfer orbit, is an Earth orbit above geosynchronous altitude of 35,786 km, used for fuel-saving transfers to GEO and satellite disposal.
Surrey Satellite Technology
Surrey Satellite Technology (SSTL) is a British small satellite manufacturer in Guildford, England, founded in 1985 as a University of Surrey spin-out and wholly owned by Airbus since 2009.
Surveyor 1
Surveyor 1 was an American robotic lunar lander that successfully performed the first United States soft landing on the Moon in the Ocean of Storms on June 2, 1966.
Surveyor 3
Surveyor 3 was an American uncrewed lunar lander that landed in Oceanus Procellarum in April 1967 and was visited by the Apollo 12 crew in 1969.
Suzaku (satellite)
Suzaku was a Japanese X-ray astronomy satellite operated by ISAS/JAXA with NASA's Goddard Space Flight Center and MIT. Launched July 10, 2005 as the recovery mission for the lost Astro-E, it observed for about ten years.
Swedish Space Corporation
The Swedish Space Corporation, also known as Svenska Rymdaktiebolaget, is a Swedish state-owned space company founded in 1972 that operates the Esrange Space Center near Kiruna.
Swift boost mission
The Swift boost mission was a 2025–2026 NASA effort to raise the decaying orbit of the Neil Gehrels Swift Observatory, which ended when the servicing spacecraft LINK failed.