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John Glenn
John Glenn, born John Herschel Glenn Jr., was an American Marine aviator, NASA astronaut, and senator from Ohio who became the first American to orbit Earth in 1962.
John Young (astronaut)
John Watts Young was an American NASA astronaut, the only person to fly in the Gemini, Apollo, and Space Shuttle programs, who walked on the Moon in 1972.
Johns Hopkins Applied Physics Laboratory
The Johns Hopkins Applied Physics Laboratory is a Navy-sponsored research center in Laurel, Maryland, known for the New Horizons Pluto mission and the Parker Solar Probe.
Johnson Space Center
Johnson Space Center, also known as the Manned Spacecraft Center, is NASA's center for human spaceflight near Houston, Texas, home of Mission Control and astronaut training since 1961.
Jonny Kim
Jonny Kim, also known as Jonathan Yong Kim, is an American Navy SEAL, Harvard-trained physician, and NASA astronaut who spent 245 days aboard the International Space Station in 2025.
José M. Hernández
José M. Hernández, also known as José Moreno Hernández, is an American engineer and former NASA astronaut who flew on Shuttle mission STS-128 in 2009.
Joseph A. Walker
Joseph A. Walker, full name Joseph Albert Walker (1921–1966), was an American NASA research pilot who twice flew the X-15 above 100 kilometers, becoming the first person in space twice.
Joseph B. Reagan
Joseph B. Reagan (1934–2011) was an American space scientist and aerospace executive who spent his career at Lockheed, building instruments for more than 20 satellite payloads.
Judith Resnik
Judith Resnik, also known as Judy Resnik, was an American engineer and NASA astronaut, the second American woman in space, killed in the 1986 Challenger accident.
Julie Payette
Julie Payette, born in 1963 in Montreal, is a Canadian engineer and former astronaut who flew two Space Shuttle missions to the International Space Station.
Juno (spacecraft)
Juno is a NASA solar-powered orbiter that has studied Jupiter from a polar orbit since July 4, 2016, launched August 5, 2011 as the second New Frontiers mission.
JunoCam
JunoCam is the color visible-light camera aboard NASA's Juno spacecraft, which has orbited Jupiter since 2016; built for public outreach, it lets the public pick targets and process images.
Jupiter Icy Moons Explorer
The Jupiter Icy Moons Explorer, or Juice, is a European Space Agency spacecraft launched in April 2023 to study Jupiter and the icy moons Ganymede, Europa, and Callisto.
Jupiter Icy Moons Orbiter
The Jupiter Icy Moons Orbiter (JIMO) was a proposed NASA mission, studied under Project Prometheus in the early 2000s, to orbit Jupiter's moons Callisto, Ganymede, and Europa with nuclear electric propulsion.
Juventas
Juventas is a 6U CubeSat built by GomSpace in Luxembourg for ESA's Hera mission, which will make the first radar soundings inside the asteroid Dimorphos and then land on it.
K. Sivan
Kailasavadivoo Sivan is an Indian aerospace engineer who led ISRO as Chairman from January 2018 to January 2022, overseeing Chandrayaan-2 and the start of the Gaganyaan program.
K2 mission
K2, also called Second Light, was a NASA repurposing of the Kepler space telescope, using two working reaction wheels to observe along the ecliptic from 2014 to 2018.
Kakuda Space Center
Kakuda Space Center (角田宇宙センター) is the rocket propulsion research and development center of JAXA in Kakuda, Miyagi Prefecture, Japan, testing liquid rocket engines, turbopumps, and scramjets.
Kalpana Chawla (कल्पना चावला)
Kalpana Chawla (कल्पना चावला) was an Indian-born American engineer and NASA astronaut, the first woman of Indian origin in space, who died in the 2003 Columbia accident.
Kappa (rocket)
The Kappa was a family of Japanese solid-propellant sounding rockets developed from 1956 by the University of Tokyo under Hideo Itokawa, flown until 1988 and foundation for later Lambda and Mu rockets.
Kapsula Kosmosa
Kapsula Kosmosa (Russian for "Cosmos capsule") was the catalog name for the autonomous Nauka science modules carried piggyback on Zenit-2M reconnaissance satellites between 1968 and 1979, cast off to run experiments before the host's retro-fire.
Kapustin Yar
Kapustin Yar (Капустин Яр) is a Russian military rocket test range in the Astrakhan region, near Volgograd, established in 1946 as the Soviet Union's first missile test range.
Kapustin Yar (Капустин Яр)
Kapustin Yar (Капустин Яр) is a Russian military rocket test range in Astrakhan Oblast, founded in 1946 as the Soviet Union's first missile test range and a spaceport from 1962.
Katherine Johnson
Katherine Johnson, born Katherine Coleman Goble Johnson, was an American mathematician at NASA whose orbital calculations were critical to early crewed spaceflights, including John Glenn's 1962 orbit, and told in Hidden Figures.
Kathleen Rubins
Kathleen Hallisey (Kate) Rubins, born 1978, is an American microbiologist and NASA astronaut who became the first person to sequence DNA in space, in 2016.
KAUR (satellite bus)
KAUR (КАУР, short for "Spacecraft of the Unified Series") is a family of standardized Soviet and Russian satellite buses developed by NPO PM in Zheleznogorsk from the 1960s onward.
Kecksburg UFO incident
The Kecksburg UFO incident, sometimes called "Pennsylvania's Roswell", was a reported 1965 crash of an unidentified object near Kecksburg, Pennsylvania, classified by the Air Force as a meteor.
Ken Mattingly
Ken Mattingly, also known as Thomas Kenneth Mattingly II, was an American NASA astronaut and Navy rear admiral who flew on Apollo 16 and commanded two shuttle missions.
Kennedy Space Center
Kennedy Space Center, formerly the Launch Operations Center, is NASA's primary launch site on Merritt Island, Florida, known for the 1969 Moon launch and Space Shuttle flights.
Kennedy Space Center Launch Complex 39
Launch Complex 39 (LC-39) is a NASA Kennedy Space Center launch complex in Florida, built in the 1960s for Apollo Saturn V Moon rockets and later all 135 space shuttle missions.