42,772 articles
GEO600
GEO600 is a British-German laser-interferometric gravitational-wave detector with 600 m arms near Hannover, Germany, operated by the Albert Einstein Institute and Leibniz Universität Hannover since 2002.
Geocentric Coordinate Time
Geocentric Coordinate Time (TCG) is the coordinate time of the Earth-centered Geocentric Celestial Reference System, a theoretical scale computed from Terrestrial Time for high-precision astronomy.
Geocentric model
The geocentric model, also known as the Ptolemaic theory or Ptolemaic cosmology, places Earth at the center of the universe and dominated astronomy for over a thousand years.
Geochemical baseline mapping
Geochemical baseline mapping is the systematic sampling and analysis of soils, stream sediments, and waters to establish element concentrations across a region, against which contamination or change is measured.
Geochemical exploration
Geochemical exploration is the systematic measurement of chemical properties in natural materials such as rock, soil, sediment, and water to locate mineral deposits through their dispersion halos.
Geochemistry
Geochemistry is the branch of earth sciences studying the chemistry of the Earth, its elements' distribution, and the processes that shaped the planet, founded by Victor Moritz Goldschmidt.
Geochimica et Cosmochimica Acta
Geochimica et Cosmochimica Acta, also known as GCA, is a peer-reviewed scientific journal covering geochemistry and cosmochemistry, published by Elsevier since 1950 and jointly sponsored by the Geochemical Society and the Meteoritical Society.
Geochronology
Geochronology, also called geological dating, is the science of determining the ages of Earth and extraterrestrial materials using radiometric dating, cosmogenic exposure dating, and paleomagnetism.
GeoDa
GeoDa, short for Geographic Data Analysis, is a free, open-source desktop program for spatial data analysis developed by Luc Anselin at the University of Chicago.
Geode
A geode is a roughly spherical rock with a hollow interior cavity lined with mineral crystals, formed when dissolved minerals precipitate in volcanic or sedimentary rock.
Geodesic
A geodesic, or geodesic path, is a locally length-minimizing curve, the straightest possible path through curved space; in the plane geodesics are straight lines, on a sphere great circles.
Geodesic curvature
Geodesic curvature, written kg, is the curvature of a curve measured within the surface it lies on; a curve with zero geodesic curvature is a geodesic.
Geodesic deviation
Geodesic deviation, also known as the geodesic deviation equation, describes how initially parallel geodesics separate in curved space, giving the relative acceleration determined by the Riemann curvature tensor.
Geodesic flow
Geodesic flow is the dynamical system on a Riemannian manifold's tangent bundle that moves each tangent vector along the geodesic it determines at constant speed, modeling free-particle motion.
Geodesic incompleteness
Geodesic incompleteness is the property of a spacetime in general relativity where a freely falling particle's or light ray's path ends after finite time, the standard definition of a singularity.
Geodesics in general relativity
In general relativity, a geodesic is the path a freely falling particle or light ray follows through curved spacetime: gravity appears not as a force but as geometry that determines which curves are straight.
Geodesics in the Kerr metric
Geodesics in the Kerr metric are the freely falling paths of particles and light around a rotating black hole, made fully integrable by the Carter constant.
Geodesy
Geodesy, also called Erdmessung or Geodetic Science, is the science of measuring the Earth's shape, orientation in space, and gravity field, and how they change.
Geodetic effect
The geodetic effect, also known as geodetic precession or de Sitter precession, is the general-relativistic precession of a gyroscope's spin axis moving through curved spacetime, predicted by Willem de Sitter in 1916.
Geoengineering Model Intercomparison Project (GeoMIP)
The Geoengineering Model Intercomparison Project (GeoMIP) is an international project, started in 2010, that runs standardized climate model experiments to study solar geoengineering's effects and impacts.
Geoff Brown
Geoffrey Charles Brown, known as Geoff Brown, was a British geophysicist and volcanologist at The Open University who pioneered volcano monitoring by microgravity and died in the 1993 Galeras eruption.
Geoff W. Coates
Geoffrey W. Coates, born 1966, is an American polymer chemist and Tisch University Professor at Cornell known for catalysts that turn carbon dioxide into recyclable polymers.
Geoffrey A. Blake
Geoffrey A. Blake is an astronomer and chemist at Caltech who studies molecules in star and planet formation, co-authoring the 2011 discovery of ocean-like water in comet Hartley 2.
Geoffrey A. Ozin
Geoffrey A. Ozin is a Canadian materials chemist at the University of Toronto, widely called the father of nanochemistry, and won the 2011 Albert Einstein World Award of Science.
Geoffrey Beach
Geoffrey S. D. Beach is a materials scientist and Toyota Professor at MIT who studies spin dynamics, domain walls, and skyrmions in magnetic thin films.
Geoffrey Blewitt
Geoffrey Blewitt is an American geophysicist at the University of Nevada, Reno, known for making GPS precise to the millimeter and elected to the National Academy of Sciences in 2024.
Geoffrey Bodenhausen
Geoffrey Bodenhausen (born 1951) is a Dutch-born French NMR spectroscopist, a pioneer of multidimensional NMR and professor emeritus at the École Normale Supérieure in Paris.
Geoffrey Burbidge
Geoffrey Ronald Burbidge (1925–2010) was a British-born astronomer who worked in the United States, co-author of the 1957 B²FH paper on element synthesis in stars.
Geoffrey Chew
Geoffrey Chew (1924–2019) was an American theoretical particle physicist at UC Berkeley who led the S-matrix approach to the strong force and its bootstrap principle, called nuclear democracy.
Geoffrey Colin Shephard
Geoffrey Colin Shephard (1927–2016) was a British mathematician who worked on convex geometry and reflection groups, co-authoring the 1954 Shephard–Todd classification and the book Tilings and Patterns.