Galactic thin disk
E140925
The Galactic thin disk is the relatively flat, rotating component of the Milky Way where most of its young to middle-aged stars, gas, and spiral arms are concentrated.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Milky Way disk | 7 |
| Galactic plane | 3 |
| Galactic thin disk canonical | 1 |
| Milky Way outer disk | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T1236488 — 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: Galactic thin disk Context triple: [Aldebaran, isMemberOf, Galactic thin disk]
-
A.
Gould Belt
The Gould Belt is a nearby, partial ring of young stars, gas, and star-forming regions tilted to the Milky Way’s plane and encompassing many of the bright constellations visible from Earth.
-
B.
Milky Way stellar halo
The Milky Way stellar halo is a vast, diffuse, roughly spherical population of old, metal-poor stars and dark matter that surrounds the Milky Way’s disk and bulge, extending far into its outer regions.
-
C.
Milky Way subgroup
The Milky Way subgroup is the collection of nearby galaxies gravitationally bound to and dominated by the Milky Way within the larger Local Group.
-
D.
Sculptor Dwarf Galaxy
The Sculptor Dwarf Galaxy is a faint, spheroidal dwarf galaxy and satellite of the Milky Way, notable for its old, metal-poor stellar population and role in studies of galaxy formation in the Local Group.
-
E.
Carina Dwarf Galaxy
The Carina Dwarf Galaxy is a faint, spheroidal satellite galaxy of the Milky Way located in the Local Group, notable for its low luminosity and predominantly old stellar population.
- 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: Galactic thin disk Target entity description: The Galactic thin disk is the relatively flat, rotating component of the Milky Way where most of its young to middle-aged stars, gas, and spiral arms are concentrated.
-
A.
Gould Belt
The Gould Belt is a nearby, partial ring of young stars, gas, and star-forming regions tilted to the Milky Way’s plane and encompassing many of the bright constellations visible from Earth.
-
B.
Milky Way stellar halo
The Milky Way stellar halo is a vast, diffuse, roughly spherical population of old, metal-poor stars and dark matter that surrounds the Milky Way’s disk and bulge, extending far into its outer regions.
-
C.
Milky Way subgroup
The Milky Way subgroup is the collection of nearby galaxies gravitationally bound to and dominated by the Milky Way within the larger Local Group.
-
D.
Sculptor Dwarf Galaxy
The Sculptor Dwarf Galaxy is a faint, spheroidal dwarf galaxy and satellite of the Milky Way, notable for its old, metal-poor stellar population and role in studies of galaxy formation in the Local Group.
-
E.
Carina Dwarf Galaxy
The Carina Dwarf Galaxy is a faint, spheroidal satellite galaxy of the Milky Way located in the Local Group, notable for its low luminosity and predominantly old stellar population.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
galactic component
ⓘ
stellar disk ⓘ |
| contains |
H II regions
ⓘ
interstellar dust ⓘ interstellar gas ⓘ middle-aged stars ⓘ molecular clouds ⓘ most of the Milky Way star-forming regions ⓘ most open star clusters ⓘ spiral arms ⓘ Sun ⓘ
surface form:
the Sun
young stars ⓘ |
| dominates | optical light of the Milky Way ⓘ |
| formed | later than thick disk ⓘ |
| hasApproximateRadialExtent |
about 15 kiloparsecs
ⓘ
about 50,000 light-years ⓘ |
| hasChemicalGradient | negative radial metallicity gradient ⓘ |
| hasFlaring | scale height increases with radius ⓘ |
| hasKinematics | differential rotation ⓘ |
| hasLocalAgeRange | about 0 to 10 billion years ⓘ |
| hasMassFraction | significant fraction of Milky Way stellar mass ⓘ |
| hasMeanAge |
a few billion years
ⓘ
younger than thick disk ⓘ |
| hasMetallicity | relatively high metallicity ⓘ |
| hasOrientation | aligned with Galactic plane ⓘ |
| hasRadialVelocityDispersion | about 30 km/s to 40 km/s ⓘ |
| hasRotationCurve | approximately flat ⓘ |
| hasRotationDirection | same as overall Milky Way rotation ⓘ |
| hasScaleHeight |
about 1000 light-years
ⓘ
about 300 parsecs ⓘ |
| hasShape | flattened disk ⓘ |
| hasStarFormationRate | a few solar masses per year for the Milky Way ⓘ |
| hasStellarPopulation |
Population I
ⓘ
surface form:
Population I stars
|
| hasSurfaceDensity | higher than thick disk near the Sun ⓘ |
| hasTypicalStellarOrbits | nearly circular orbits ⓘ |
| hasVelocityDispersion | lower than thick disk ⓘ |
| hasVerticalMetallicityGradient | metallicity decreases with height above plane ⓘ |
| hasVerticalStructure | exponential density profile ⓘ |
| hasVerticalVelocityDispersion | about 20 km/s to 30 km/s ⓘ |
| hasWarp | outer disk warp ⓘ |
| isDistinguishedFrom |
Milky Way center
ⓘ
surface form:
Galactic bulge
Galactic stellar halo ⓘ Galactic thick disk ⓘ |
| isSiteOf | ongoing star formation ⓘ |
| isTracedBy |
CO emission
ⓘ
Cepheid variables ⓘ H I 21-cm emission ⓘ young OB stars ⓘ |
| partOf | Milky Way ⓘ |
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: Galactic thin disk Description of subject: The Galactic thin disk is the relatively flat, rotating component of the Milky Way where most of its young to middle-aged stars, gas, and spiral arms are concentrated.
Referenced by (12)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Aldebaran
this entity surface form:
Milky Way disk
this entity surface form:
Galactic plane
this entity surface form:
Milky Way disk
this entity surface form:
Milky Way outer disk
this entity surface form:
Milky Way disk
this entity surface form:
Galactic plane
this entity surface form:
Milky Way disk
this entity surface form:
Milky Way disk
this entity surface form:
Galactic plane