MMRTG
E86318
The MMRTG (Multi-Mission Radioisotope Thermoelectric Generator) is a long-lived nuclear power system that converts heat from decaying plutonium into electricity for spacecraft and planetary rovers like Curiosity.
All labels observed (5)
| Label | Occurrences |
|---|---|
| Multi-Mission Radioisotope Thermoelectric Generator | 4 |
| MMRTG canonical | 3 |
| New Horizons RTG | 1 |
| Radioisotope Thermoelectric Generator | 1 |
| radioisotope thermoelectric generator | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T727758 — 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: MMRTG Context triple: [Curiosity rover, powerSource, MMRTG]
-
A.
K-West Reactor
K-West Reactor is one of the plutonium production reactors at the Hanford Site in Washington State, historically used to support the U.S. nuclear weapons program.
-
B.
X-10 graphite reactor
The X-10 graphite reactor was an early nuclear reactor at Oak Ridge, Tennessee, built during the Manhattan Project as a pilot plant for plutonium production and a key step toward the development of nuclear weapons and nuclear energy.
-
C.
D Reactor
D Reactor was one of the early plutonium production reactors at the Hanford Site in Washington, built during the Manhattan Project to support the U.S. nuclear weapons program.
-
D.
Cherno Alpha
Cherno Alpha is a massive Mark-1 Russian Jaeger from the Pacific Rim universe, renowned for its heavy armor, brutal close-combat power, and role in defending humanity against Kaiju attacks.
-
E.
Merlin 1C
Merlin 1C is a liquid-fueled rocket engine developed by SpaceX for use on early Falcon rockets, notable for its role in pioneering the company’s orbital launch capabilities.
- 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: MMRTG Target entity description: The MMRTG (Multi-Mission Radioisotope Thermoelectric Generator) is a long-lived nuclear power system that converts heat from decaying plutonium into electricity for spacecraft and planetary rovers like Curiosity.
-
A.
K-West Reactor
K-West Reactor is one of the plutonium production reactors at the Hanford Site in Washington State, historically used to support the U.S. nuclear weapons program.
-
B.
X-10 graphite reactor
The X-10 graphite reactor was an early nuclear reactor at Oak Ridge, Tennessee, built during the Manhattan Project as a pilot plant for plutonium production and a key step toward the development of nuclear weapons and nuclear energy.
-
C.
D Reactor
D Reactor was one of the early plutonium production reactors at the Hanford Site in Washington, built during the Manhattan Project to support the U.S. nuclear weapons program.
-
D.
Cherno Alpha
Cherno Alpha is a massive Mark-1 Russian Jaeger from the Pacific Rim universe, renowned for its heavy armor, brutal close-combat power, and role in defending humanity against Kaiju attacks.
-
E.
Merlin 1C
Merlin 1C is a liquid-fueled rocket engine developed by SpaceX for use on early Falcon rockets, notable for its role in pioneering the company’s orbital launch capabilities.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
nuclear power source
ⓘ
radioisotope thermoelectric generator ⓘ spacecraft power system ⓘ |
| abbreviationOf |
MMRTG
self-linksurface differs
ⓘ
surface form:
Multi-Mission Radioisotope Thermoelectric Generator
|
| advantage |
high reliability with no moving parts
ⓘ
independent of solar illumination ⓘ long operational lifetime ⓘ |
| application |
Mars rovers
ⓘ
deep space missions ⓘ planetary surface missions ⓘ |
| category | space nuclear power system ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| designedBy |
Lockheed Martin Space
ⓘ
surface form:
Lockheed Martin Space Systems
|
| designedFor |
planetary landers
ⓘ
planetary rovers ⓘ spacecraft ⓘ |
| designedForEnvironment |
planetary surface conditions
ⓘ
vacuum of space ⓘ |
| designedLifetime | 14 years or more ⓘ |
| developer |
NASA
ⓘ
U.S. Department of Energy ⓘ |
| electricalPowerAtBeginningOfLife | approximately 110 watts ⓘ |
| energyConversionMethod | thermoelectric conversion ⓘ |
| firstFlightUse |
Mars Science Laboratory
ⓘ
surface form:
Mars Science Laboratory mission
|
| fuelForm | plutonium-238 dioxide ⓘ |
| fuelType | radioisotope fuel ⓘ |
| fullName |
MMRTG
self-linksurface differs
ⓘ
surface form:
Multi-Mission Radioisotope Thermoelectric Generator
|
| heatSource | radioactive decay ⓘ |
| mass | approximately 45 kilograms ⓘ |
| missionType | multi-mission ⓘ |
| powerDegradation | declines over mission lifetime ⓘ |
| powers |
Curiosity rover
ⓘ
Mars Science Laboratory ⓘ
surface form:
Mars Science Laboratory spacecraft
|
| powerSource | plutonium-238 ⓘ |
| provides |
continuous electrical power
ⓘ
waste heat for thermal control ⓘ |
| regulatoryOversight | U.S. Department of Energy ⓘ |
| safetyFeature |
multiple containment barriers
ⓘ
robust fuel encapsulation ⓘ |
| successorTo | earlier RTG designs used by NASA ⓘ |
| supports |
communications systems
ⓘ
mobility systems on rovers ⓘ onboard computers ⓘ science instruments ⓘ |
| thermalPower | approximately 2000 watts ⓘ |
| usedByAgency | NASA ⓘ |
| usedOnBody | Mars ⓘ |
| usesEffect | Seebeck effect ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: MMRTG Description of subject: The MMRTG (Multi-Mission Radioisotope Thermoelectric Generator) is a long-lived nuclear power system that converts heat from decaying plutonium into electricity for spacecraft and planetary rovers like Curiosity.
Referenced by (10)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Multi-Mission Radioisotope Thermoelectric Generator
this entity surface form:
Multi-Mission Radioisotope Thermoelectric Generator
this entity surface form:
Multi-Mission Radioisotope Thermoelectric Generator
this entity surface form:
Multi-Mission Radioisotope Thermoelectric Generator
this entity surface form:
New Horizons RTG
this entity surface form:
radioisotope thermoelectric generator