Gravity Probe B experiment
E236241
Gravity Probe B experiment was a NASA-led satellite mission designed to precisely measure how Earth's gravity warps space and time, providing a high-accuracy test of key predictions of Einstein's general relativity.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Gravity Probe B Relativity Mission | 1 |
| Gravity Probe B experiment canonical | 1 |
| de Sitter precession | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2125960 — 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: Gravity Probe B experiment Context triple: [general relativity, testedBy, Gravity Probe B experiment]
-
A.
Hafele–Keating experiment
The Hafele–Keating experiment was a 1971 test of Einstein’s theory of relativity in which atomic clocks were flown around the world on commercial airliners and compared with stationary clocks to measure time dilation effects.
-
B.
Ives–Stilwell experiment
The Ives–Stilwell experiment is a classic test of special relativity that measured the relativistic Doppler effect to confirm time dilation for fast-moving ions.
-
C.
Kennedy–Thorndike experiment
The Kennedy–Thorndike experiment is a classic test of special relativity that examined the constancy of the speed of light using an interferometer with unequal arm lengths and varying laboratory velocity.
-
D.
Michelson–Morley experiment
The Michelson–Morley experiment was a landmark 1887 physics experiment that attempted to detect the Earth's motion through the hypothesized luminiferous aether and whose null result helped pave the way for Einstein's theory of special relativity.
-
E.
Cavendish experiment
The Cavendish experiment was an 18th-century physics experiment by Henry Cavendish that measured the tiny gravitational attraction between lead spheres, allowing the first calculation of the gravitational constant and the mass of the Earth.
- 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: Gravity Probe B experiment Target entity description: Gravity Probe B experiment was a NASA-led satellite mission designed to precisely measure how Earth's gravity warps space and time, providing a high-accuracy test of key predictions of Einstein's general relativity.
-
A.
Hafele–Keating experiment
The Hafele–Keating experiment was a 1971 test of Einstein’s theory of relativity in which atomic clocks were flown around the world on commercial airliners and compared with stationary clocks to measure time dilation effects.
-
B.
Ives–Stilwell experiment
The Ives–Stilwell experiment is a classic test of special relativity that measured the relativistic Doppler effect to confirm time dilation for fast-moving ions.
-
C.
Kennedy–Thorndike experiment
The Kennedy–Thorndike experiment is a classic test of special relativity that examined the constancy of the speed of light using an interferometer with unequal arm lengths and varying laboratory velocity.
-
D.
Michelson–Morley experiment
The Michelson–Morley experiment was a landmark 1887 physics experiment that attempted to detect the Earth's motion through the hypothesized luminiferous aether and whose null result helped pave the way for Einstein's theory of special relativity.
-
E.
Cavendish experiment
The Cavendish experiment was an 18th-century physics experiment by Henry Cavendish that measured the tiny gravitational attraction between lead spheres, allowing the first calculation of the gravitational constant and the mass of the Earth.
- F. None of above. chosen
Statements (52)
| Predicate | Object |
|---|---|
| instanceOf |
physics experiment
ⓘ
satellite mission ⓘ test of general relativity ⓘ |
| abbreviation | GP-B ⓘ |
| collaboratingInstitution |
Lockheed Martin
ⓘ
University of Maryland ⓘ |
| confirmedEffect |
frame-dragging effect consistent with general relativity
ⓘ
geodetic effect consistent with general relativity ⓘ |
| coolingMethod | superfluid helium dewar ⓘ |
| countryOfOrigin |
United States of America
ⓘ
surface form:
United States
|
| dataAnalysisEnd | 2011 ⓘ |
| dataCollectionEnd | 2005 ⓘ |
| developmentDuration | about 40 years ⓘ |
| frameDraggingAccuracy | about 19 percent ⓘ |
| fullName |
Gravity Probe B experiment
self-linksurface differs
ⓘ
surface form:
Gravity Probe B Relativity Mission
|
| fundingAgency | NASA ⓘ |
| geodeticEffectAccuracy | about 0.3 percent ⓘ |
| guideStar | IM Pegasi ⓘ |
| gyroscopeTechnology | superconducting gyroscopes ⓘ |
| instrument |
four ultra-precise gyroscopes
ⓘ
guide star telescope ⓘ |
| launchCountry |
United States of America
ⓘ
surface form:
United States
|
| launchDate | 2004-04-20 ⓘ |
| launchSite |
Space Launch Complex 2
ⓘ
surface form:
Space Launch Complex 2W
Vandenberg Space Force Base ⓘ
surface form:
Vandenberg Air Force Base
|
| launchVehicle |
Delta rocket
ⓘ
surface form:
Delta II 7920-10
|
| managingCenter |
Ames Research Center
ⓘ
surface form:
NASA Ames Research Center
|
| measurementMethod | cryogenic gyroscopes ⓘ |
| missionCost | approximately 750 million US dollars ⓘ |
| missionEnd | 2010 ⓘ |
| missionStart | 2004 ⓘ |
| missionType |
Earth-orbiting satellite
ⓘ
space-based experiment ⓘ |
| objective |
measure frame-dragging effect
ⓘ
measure geodetic effect ⓘ |
| operator | NASA ⓘ |
| orbitAltitude | approximately 642 km ⓘ |
| orbitInclination | 90.0 degrees ⓘ |
| orbitType |
low Earth orbit
ⓘ
polar orbit ⓘ |
| primaryObjective | test predictions of Einstein's general theory of relativity ⓘ |
| principalInvestigator | Francis Everitt ⓘ |
| proposalDecade | 1960s ⓘ |
| resultPublicationYear | 2011 ⓘ |
| scienceLeadInstitution | Stanford University ⓘ |
| scientificDiscipline |
experimental gravitation
ⓘ
relativistic physics ⓘ |
| spaceAgency | NASA ⓘ |
| spacecraftBus | custom Lockheed Martin design ⓘ |
| testedPrediction |
frame-dragging precession
ⓘ
geodetic precession ⓘ |
| testedTheory | general relativity ⓘ |
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: Gravity Probe B experiment Description of subject: Gravity Probe B experiment was a NASA-led satellite mission designed to precisely measure how Earth's gravity warps space and time, providing a high-accuracy test of key predictions of Einstein's general relativity.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
de Sitter precession
subject surface form:
Gravity Probe B
this entity surface form:
Gravity Probe B Relativity Mission