Mare Nectaris
E572144
Mare Nectaris is a small, circular lunar mare formed by an ancient impact basin on the Moon’s near side, known for its smooth basaltic plains and role in mapping the Moon’s geological history.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Mare Nectaris canonical | 4 |
How this entity was disambiguated
This entity first appeared as the object of triple T6042803 — 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: Mare Nectaris Context triple: [Mare Tranquillitatis, boundedBy, Mare Nectaris]
-
A.
Mare Serenitatis
Mare Serenitatis is a large lunar mare, or basaltic plain, on the Moon’s near side, easily visible from Earth as a dark, circular feature formed by ancient volcanic activity.
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B.
Mare Imbrium
Mare Imbrium is a vast, dark lunar mare formed by ancient volcanic activity, prominent on the Moon’s near side and notable as the landing site of several Apollo missions.
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C.
Mare Fecunditatis
Mare Fecunditatis is a large lunar mare on the Moon’s near side, characterized by its dark basaltic plains formed from ancient volcanic activity.
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D.
Mare Insularum
Mare Insularum is a lunar mare, or basaltic plain, on the Moon’s near side, formed by ancient volcanic activity and located near prominent craters such as Copernicus.
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E.
Mare Tranquillitatis
Mare Tranquillitatis is a lunar mare on the Moon’s near side, best known as the site of Apollo 11’s first crewed Moon landing.
- 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: Mare Nectaris Target entity description: Mare Nectaris is a small, circular lunar mare formed by an ancient impact basin on the Moon’s near side, known for its smooth basaltic plains and role in mapping the Moon’s geological history.
-
A.
Mare Serenitatis
Mare Serenitatis is a large lunar mare, or basaltic plain, on the Moon’s near side, easily visible from Earth as a dark, circular feature formed by ancient volcanic activity.
-
B.
Mare Imbrium
Mare Imbrium is a vast, dark lunar mare formed by ancient volcanic activity, prominent on the Moon’s near side and notable as the landing site of several Apollo missions.
-
C.
Mare Fecunditatis
Mare Fecunditatis is a large lunar mare on the Moon’s near side, characterized by its dark basaltic plains formed from ancient volcanic activity.
-
D.
Mare Insularum
Mare Insularum is a lunar mare, or basaltic plain, on the Moon’s near side, formed by ancient volcanic activity and located near prominent craters such as Copernicus.
-
E.
Mare Tranquillitatis
Mare Tranquillitatis is a lunar mare on the Moon’s near side, best known as the site of Apollo 11’s first crewed Moon landing.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
impact basin
ⓘ
lunar mare ⓘ |
| adjacentTo |
Mare Fecunditatis
ⓘ
Mare Serenitatis ⓘ Mare Tranquillitatis ⓘ |
| age |
Nectarian period
ⓘ
linked to:
Late Heavy Bombardment era
|
| albedo | low ⓘ |
| basinType | multi-ring impact basin ⓘ |
| belongsTo |
inner solar system bodies
ⓘ
near-side impact basins sequence ⓘ |
| boundedBy | Altai Scarp ⓘ |
| coordinates | approximately 15°S 35°E ⓘ |
| defines | Nectarian system ⓘ |
| diameter | about 340 km ⓘ |
| eponym | Sea of Nectar ⓘ |
| formedBy | ancient impact event ⓘ |
| geologicAge | approximately 3.9 billion years ⓘ |
| gravityAnomaly | mascon present ⓘ |
| hasRingStructure | multiple concentric rings ⓘ |
| importance | key reference for lunar geologic timescale ⓘ |
| isPartOf | lunar nearside maria ⓘ |
| lavaFill | thin mare basalt layer ⓘ |
| locatedOn | Moon ⓘ |
| locatedOnSideOfMoon | near side ⓘ |
| mareVolcanismAge | about 3.8–3.6 billion years ⓘ |
| nameLanguage | Latin ⓘ |
| observedBy | Galileo Galilei ⓘ |
| orbitalBody | Earth–Moon system ⓘ |
| quadrant | southeastern nearside ⓘ |
| relativeSize | smaller than Mare Imbrium ⓘ |
| rimContainsCrater |
Catharina
ⓘ
Cyrillus ⓘ Fracastorius ⓘ Theophilus ⓘ |
| shape | roughly circular ⓘ |
| spectralType | low-Ti mare basalt ⓘ |
| studiedByMission |
Clementine
ⓘ
Lunar Orbiter program ⓘ Lunar Reconnaissance Orbiter ⓘ |
| surfaceComposition | basaltic plains ⓘ |
| surfaceFeature |
small impact craters
ⓘ
wrinkle ridges ⓘ |
| surfaceType | smooth lava plain ⓘ |
| underlainBy | impact melt sheet ⓘ |
| usedFor | lunar stratigraphic dating ⓘ |
| visibleFrom | Earth with small telescopes ⓘ |
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: Mare Nectaris Description of subject: Mare Nectaris is a small, circular lunar mare formed by an ancient impact basin on the Moon’s near side, known for its smooth basaltic plains and role in mapping the Moon’s geological history.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.