All articles starting with G
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Gravity gradiometer
A gravity gradiometer is an instrument that measures the rate at which gravity changes from one point to a nearby point, used in resource exploration and passive navigation.
Gravity gradiometry
Gravity gradiometry is a geophysical surveying method that measures how gravitational acceleration changes from point to point, revealing subsurface density structure from aircraft or satellites.
Gravity hill
Gravity hill, also called magnetic hill, spook hill, or mystery spot: a road where an optical illusion from an obstructed horizon makes a downhill slope look uphill, so cars in neutral appear to roll uphill; measurements find no gravity anomalies.
Gravity inversion
Gravity inversion is the geophysical process of estimating a subsurface density model from measured gravity anomalies. It is non-unique and unstable, so regularization and constraints are needed.
Gravity knife
A gravity knife is a knife whose blade is released by gravity or centrifugal force and locks in place, a category long entangled in American criminal law.
Gravity loss
Gravity loss is the reduction in a rocket's velocity gain caused by gravity during powered flight, typically the largest loss in an ascent to orbit.
Gravity model of trade
The gravity model of trade is an empirical model where bilateral trade is proportional to two economies' GDPs and inversely related to distance, introduced by Jan Tinbergen in 1962.
Gravity of Earth
The gravity of Earth, also called little g, is the acceleration objects feel at its surface: a standard 9.80665 m/s² that actually varies by about 0.7 percent with location.
Gravity Payments
Gravity Payments is a Seattle-based payment processing company that serves over 13,000 merchants. Founded in 2004, it processed $6.5 billion before Dan Price resigned as CEO in 2022.
Gravity Probe A
Gravity Probe A was a 1976 NASA suborbital experiment that confirmed general relativity's gravitational redshift by flying a hydrogen maser clock to 10,000 km altitude.
Gravity Probe B
Gravity Probe B, a NASA-Stanford physics satellite launched in 2004, tested Einstein's general relativity by measuring geodetic and frame-dragging effects with four cryogenic gyroscopes, announcing results in 2011.
Gravity Recovery and Interior Laboratory (GRAIL)
The Gravity Recovery and Interior Laboratory (GRAIL) was a NASA mission that used twin spacecraft, Ebb and Flow, to map the Moon's gravity field from 2011 to 2012.
Gravity Rush
Gravity Rush, known as Gravity Daze, is an open-world action-adventure game built around gravity shifting, released for the PlayStation Vita in June 2012 and directed by Keiichiro Toyama.
Gravity Rush 2
Gravity Rush 2 (Gravity Daze 2) is a 2017 Project Siren action-adventure for PS4, directed by Keiichiro Toyama, starring Kat's gravity-shifting traversal with Normal, Lunar, and Jupiter styles; Metacritic 80, servers closed July 2018.
Gravity separation
Gravity separation is a physical beneficiation method that separates particles of different densities by their settling behavior in water, used mainly for coal washing and gold recovery.
Gravity Suits
Gravity suits: inflatable lower-body counterpressure garments, from Crile's 1903 pneumatic suit to pilot G-suits and the medical MAST/PASG anti-shock trousers, now largely abandoned after Cochrane review found no survival benefit.
Gravity turn
A gravity turn, also called a zero-lift turn, is a rocket ascent maneuver where gravity bends the trajectory from vertical flight toward the horizontal velocity needed for orbit.
Gravity wave
A gravity wave is a wave in a fluid, such as the ocean or atmosphere, in which gravity and buoyancy act as the restoring force on displaced fluid.
Gravity well
A gravity well is the region around a mass within which objects are bound by its gravity, visualized as a depression in gravitational potential energy.
Gravity-1
Gravity-1 (Yinli-1) is a Chinese solid-propellant orbital launch vehicle developed by Orienspace, the world's largest solid rocket, capable of 6.5 tonnes to low Earth orbit.
Gravity-2
Gravity-2 (引力二号, also romanized Yinli-2) is a two-stage, partially reusable Chinese launch vehicle under development by Orienspace, designed to place 21.5 tonnes into low Earth orbit with a recoverable first stage.
Gravity-aided navigation
Gravity-aided navigation is a passive positioning technique matching a vehicle's onboard gravity measurements to a geo-referenced gravity map, correcting inertial drift where satellite signals cannot reach.
Gravity-gradient stabilization
Gravity-gradient stabilization is a passive spacecraft attitude control method using the torque from gravity's variation across a spacecraft to keep one axis pointed toward Earth, requiring no propellant.
Gravity's Rainbow
Gravity's Rainbow is Thomas Pynchon's 1973 postmodern novel set in the last year of World War II, following American GI Tyrone Slothrop and the V-2 rocket, an encyclopedic work of about 400 characters compared to Ulysses.
Gravy
Gravy: a sauce made from meat or poultry drippings, a liquid such as milk or broth, and a thickener like roux; from Old French grave; includes pan gravy, British brown gravy, Southern white gravy, and Italian-American Sunday gravy.
Gray (musician)
Gray, real name Nicolas Gray, is a London-born drum and bass DJ and producer based in Bristol, best known for the 2019 single "Rubadub" and the Born on Road label.
Gray (unit)
The gray (Gy) is the SI unit of absorbed dose of ionizing radiation, equal to one joule per kilogram, adopted in 1975 and replacing the rad.
Gray asexuality
Gray asexuality (graysexual, Gray-A) is an ace-spectrum identity for people with rare, weak, or situational sexual attraction, between asexual and allosexual; coined on AVEN in 2006, about 10% of ace individuals identify with it.
Gray Atkins
Gray Atkins is a fictional EastEnders solicitor played by Toby-Alexander Smith (2019-2022, 2026 return), who abused and murdered wife Chantelle, then killed Tina Carter and Kush Kazemi before arrest.
Gray Camp
J. Gray Camp is a Swiss-based developmental and computational biologist at Roche's Institute of Human Biology in Basel, known for single-cell atlases of human organoids.