Manned Maneuvering Unit

E179325

NASA spaceflight hardware astronaut propulsion system extravehicular activity equipment

The Manned Maneuvering Unit is a NASA-developed, backpack-like propulsion system that allowed astronauts to fly untethered in space during early Space Shuttle missions.

Try in SPARQL Jump to: Surface forms Disambiguation Statements Elicitation Referenced by

All labels observed (3)

Label	Occurrences
Manned Maneuvering Unit canonical	4
Simplified Aid for EVA Rescue	1
test Astronaut Maneuvering Unit	1

How this entity was disambiguated

This entity first appeared as the object of triple T1583757 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.

NED1 Entity disambiguation (via context triple) gpt-5-mini-2025-08-07

Target entity: Manned Maneuvering Unit
Context triple: [STS-41B, usedEquipment, Manned Maneuvering Unit]

A. Apollo Lunar Module
The Apollo Lunar Module was the two-stage spacecraft used by NASA during the Apollo missions to land astronauts on the Moon and return them to lunar orbit.
B. Mobile Servicing System
The Mobile Servicing System is a Canadian-built robotic system on the International Space Station used for assembly, maintenance, and cargo handling in orbit.
C. Orion spacecraft
The Orion spacecraft is NASA’s next-generation crewed space vehicle designed to carry astronauts beyond low Earth orbit on deep-space missions, including journeys to the Moon and eventually Mars.
D. SLIM lunar lander
The SLIM lunar lander is a Japanese spacecraft designed by JAXA to demonstrate high-precision, lightweight landing technology on the Moon’s surface.
E. ATV spacecraft
The ATV spacecraft was an automated European cargo vehicle designed to resupply and reboost the International Space Station.
F. None of above. chosen
G. Unsure - the case is ambiguous/there is not enough information to decide.

NED2 Entity disambiguation (via description) gpt-5-mini-2025-08-07

Target entity: Manned Maneuvering Unit
Target entity description: The Manned Maneuvering Unit is a NASA-developed, backpack-like propulsion system that allowed astronauts to fly untethered in space during early Space Shuttle missions.

A. Apollo Lunar Module
The Apollo Lunar Module was the two-stage spacecraft used by NASA during the Apollo missions to land astronauts on the Moon and return them to lunar orbit.
B. Mobile Servicing System
The Mobile Servicing System is a Canadian-built robotic system on the International Space Station used for assembly, maintenance, and cargo handling in orbit.
C. Orion spacecraft
The Orion spacecraft is NASA’s next-generation crewed space vehicle designed to carry astronauts beyond low Earth orbit on deep-space missions, including journeys to the Moon and eventually Mars.
D. SLIM lunar lander
The SLIM lunar lander is a Japanese spacecraft designed by JAXA to demonstrate high-precision, lightweight landing technology on the Moon’s surface.
E. ATV spacecraft
The ATV spacecraft was an automated European cargo vehicle designed to resupply and reboost the International Space Station.
F. None of above. chosen

Statements (48)

Predicate	Object
instanceOf	NASA spaceflight hardware ⓘ astronaut propulsion system ⓘ extravehicular activity equipment ⓘ
abbreviation	MMU ⓘ
alsoKnownAs	MMU backpack ⓘ
compatibleWith	Shuttle Extravehicular Mobility Unit ⓘ
controlAxes	six degrees of freedom ⓘ
controlMethod	hand controllers ⓘ
countryOfOrigin	United States ⓘ linked to: United States of America
designedForEnvironment	microgravity ⓘ
developedBy	NASA Johnson Space Center ⓘ linked to: Johnson Space Center
developer	NASA ⓘ
displayLocation	Johnson Space Center ⓘ National Air and Space Museum ⓘ linked to: National Air and Space Museum, Washington, D.C.
era	early Space Shuttle program ⓘ
firstFlightDate	1984-02-07 ⓘ
firstUntetheredSpacewalkDate	1984-02-07 ⓘ
firstUsedOnMission	STS-41-B ⓘ linked to: STS-41B
lastFlightYear	1984 ⓘ
lastUsedOnMission	STS-51-A ⓘ linked to: STS-51A
mass	approximately 148 kilograms ⓘ
maxOperatingDistanceFromShuttle	approximately 100 meters nominal ⓘ
maxTranslationSpeed	about 25 meters per second ⓘ
mounting	backpack-like unit worn over spacesuit ⓘ
notableEvent	first untethered spacewalk by Bruce McCandless II ⓘ
notableUser	Bruce McCandless II ⓘ George D. Nelson NERFINISHED ⓘ James D. A. van Hoften ⓘ linked to: James D. van Hoften Joseph P. Allen ⓘ Robert L. Stewart NERFINISHED ⓘ
numberOfThrusters	24 ⓘ
operatedIn	low Earth orbit ⓘ
primaryFunction	untethered astronaut maneuvering in space ⓘ
propellant	gaseous nitrogen ⓘ
propulsionType	compressed nitrogen gas thrusters ⓘ
reasonForRetirement	change in mission priorities ⓘ safety concerns ⓘ
replacedBy	Simplified Aid for EVA Rescue ⓘ linked to: Manned Maneuvering Unit
safetyFeature	built-in emergency return capability ⓘ
status	retired ⓘ
thrust	approximately 24 newtons per thruster ⓘ
usedFor	extravehicular activity ⓘ satellite repair ⓘ satellite retrieval ⓘ
usedOnMission	STS-41-B ⓘ linked to: STS-41B STS-41-C ⓘ linked to: STS-41C STS-51-A ⓘ linked to: STS-51A
usedOnVehicle	Space Shuttle ⓘ

How these facts were elicited

Referenced by (6)

Full triples — surface form annotated when it differs from this entity's canonical label.

STS-41B → usedEquipment → Manned Maneuvering Unit ⓘ

Manned Maneuvering Unit → replacedBy → Simplified Aid for EVA Rescue ⓘ

linked to: Manned Maneuvering Unit

Westar 6 stranded in improper orbit → technologyUsedInRescue → Manned Maneuvering Unit ⓘ

STS-51A → usedEquipment → Manned Maneuvering Unit ⓘ

Bruce McCandless II → usedEquipment → Manned Maneuvering Unit ⓘ

Gemini 9A → evaPurpose → test Astronaut Maneuvering Unit ⓘ