Recalibration of the Hubble constant
E911975
Recalibration of the Hubble constant is a landmark astrophysical study by Allan R. Sandage that refined the value of the universe’s expansion rate using improved distance measurements to galaxies.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Recalibration of the Hubble constant canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11210504 — 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: Recalibration of the Hubble constant Context triple: [Allan R. Sandage, notableWork, Recalibration of the Hubble constant]
-
A.
Hubble–Humason galaxy redshift measurements
The Hubble–Humason galaxy redshift measurements are a landmark set of observations that extended and refined Edwin Hubble’s work on the expanding universe by systematically measuring the redshifts of distant galaxies.
-
B.
Tully-Fisher relation distances
Tully-Fisher relation distances are galaxy distance measurements derived from the empirical correlation between a spiral galaxy’s luminosity and its rotational velocity.
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C.
The Large-Scale Structure of the Universe
The Large-Scale Structure of the Universe is a foundational cosmology book by James Peebles that systematically develops the theory and observations of how matter is distributed on the largest cosmic scales.
-
D.
Tolman surface brightness test
The Tolman surface brightness test is an observational cosmology method that checks whether the universe is expanding by examining how the surface brightness of distant galaxies diminishes with redshift.
-
E.
Quintessence: The Mystery of Missing Mass in the Universe
"Quintessence: The Mystery of Missing Mass in the Universe" is a popular science book that explores the nature of dark matter, dark energy, and the cosmic forces shaping the universe’s structure and fate.
- 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: Recalibration of the Hubble constant Target entity description: Recalibration of the Hubble constant is a landmark astrophysical study by Allan R. Sandage that refined the value of the universe’s expansion rate using improved distance measurements to galaxies.
-
A.
Hubble–Humason galaxy redshift measurements
The Hubble–Humason galaxy redshift measurements are a landmark set of observations that extended and refined Edwin Hubble’s work on the expanding universe by systematically measuring the redshifts of distant galaxies.
-
B.
Tully-Fisher relation distances
Tully-Fisher relation distances are galaxy distance measurements derived from the empirical correlation between a spiral galaxy’s luminosity and its rotational velocity.
-
C.
The Large-Scale Structure of the Universe
The Large-Scale Structure of the Universe is a foundational cosmology book by James Peebles that systematically develops the theory and observations of how matter is distributed on the largest cosmic scales.
-
D.
Tolman surface brightness test
The Tolman surface brightness test is an observational cosmology method that checks whether the universe is expanding by examining how the surface brightness of distant galaxies diminishes with redshift.
-
E.
Quintessence: The Mystery of Missing Mass in the Universe
"Quintessence: The Mystery of Missing Mass in the Universe" is a popular science book that explores the nature of dark matter, dark energy, and the cosmic forces shaping the universe’s structure and fate.
- F. None of above. chosen
Statements (35)
| Predicate | Object |
|---|---|
| instanceOf |
astrophysical study
ⓘ
scientific paper ⓘ |
| aimsTo |
reduce uncertainties in the cosmic distance scale
ⓘ
refine the value of the Hubble constant ⓘ |
| author | Allan R. Sandage NERFINISHED ⓘ |
| contribution |
corrected earlier overestimates of the Hubble constant
ⓘ
helped establish a modern value for the Hubble constant ⓘ provided a more accurate estimate of the universe’s expansion rate ⓘ |
| describedAs | landmark astrophysical study ⓘ |
| field |
cosmology
ⓘ
extragalactic astronomy ⓘ observational astronomy ⓘ |
| focusesOn |
distance scale of the universe
ⓘ
universe expansion rate ⓘ |
| genre | peer‑reviewed research article ⓘ |
| hasImpactOn |
cosmological distance ladder
ⓘ
estimates of the age of the universe ⓘ modern cosmological models ⓘ |
| influencedBy |
Edwin Hubble’s original measurements
ⓘ
better calibration of standard candles ⓘ improvements in photometric techniques ⓘ |
| language | English ⓘ |
| mainSubject | Hubble constant NERFINISHED ⓘ |
| partOf |
efforts to resolve discrepancies in the Hubble constant
ⓘ
historical development of the cosmic distance scale ⓘ |
| relatesTo |
Hubble–Lemaître law
NERFINISHED
ⓘ
cosmic expansion ⓘ |
| studies | relationship between galaxy distances and recession velocities ⓘ |
| topic |
calibration of extragalactic distance indicators
ⓘ
precision measurement of cosmological parameters ⓘ systematic errors in distance measurements ⓘ |
| usesMethod |
Cepheid variable stars
NERFINISHED
ⓘ
galaxy distance indicators ⓘ improved distance measurements to galaxies ⓘ standard candles ⓘ |
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: Recalibration of the Hubble constant Description of subject: Recalibration of the Hubble constant is a landmark astrophysical study by Allan R. Sandage that refined the value of the universe’s expansion rate using improved distance measurements to galaxies.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Allan R. Sandage