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Great Hanshin earthquake (阪神・淡路大震災)
The Great Hanshin earthquake, also known as the Kobe earthquake, was a magnitude 7.3 quake that struck Kobe, Japan, on January 17, 1995, killing 6,434 people.
Great Hurricane of 1780
The Great Hurricane of 1780, also known as Hurricane San Calixto, crossed the eastern Caribbean in October 1780 and remains the deadliest Atlantic hurricane, killing about 22,000 people.
Great inequality
The great inequality (la grande inégalité) is a roughly 900-year oscillation in the mean longitudes of Jupiter and Saturn, caused by their near 5:2 orbital resonance.
Great Internet Mersenne Prime Search
The Great Internet Mersenne Prime Search (GIMPS) is a volunteer computing project founded by George Woltman in 1996 that has discovered the last 18 Mersenne primes, including the largest known prime.
Great Observatories Origins Deep Survey
The Great Observatories Origins Deep Survey (GOODS) is a multiwavelength astronomical survey combining Hubble, Spitzer, and Chandra data on two deep fields to study galaxy formation and evolution.
Great Oxidation Event
The Great Oxidation Event, also known as the Oxygen Catastrophe, began roughly 2.4 billion years ago, when oxygen produced by photosynthetic microbes first accumulated in Earth's atmosphere and oceans, permanently changing the planet's surface.
Great Plains low-level jet
The Great Plains low-level jet is a fast southerly airstream in the lower atmosphere over the central United States, most frequent at night in the warm season.
Great Red Spot
The Great Red Spot (GRS) is a giant anticyclonic storm in Jupiter's southern hemisphere, the largest and longest-lived known vortex of any planet in the solar system.
Great Rift
The Great Rift is a band of overlapping dark nebulae, cold dust clouds that seem to split the Milky Way in half, stretching from Cygnus toward Sagittarius.
Great Sitkin
Great Sitkin is an active andesitic stratovolcano with a summit caldera on uninhabited Great Sitkin Island in the western Aleutian Islands, Alaska, in continuous eruption since May 2021 with slow lava effusion since July 2021.
Great storm of 1703
The Great storm of 1703 was a violently destructive cyclone that struck southern England and northern France in late November 1703, killing an estimated 8,000 to 15,000 people.
Great storm of 1987
The Great Storm of 1987 was an extratropical cyclone that struck southern Britain and northern France on 15–16 October 1987, felling about 15 million trees.
Great white shark size
The size of the great white shark: adult males run 3.5 to 4 meters and females 4.5 to 5 meters, with the largest reliably measured individuals just under 6 meters.
Great White Spot
The Great White Spot (GWS) is a large, bright planet-encircling storm that erupts on Saturn roughly every 29.5 Earth years, with six recorded since 1876.
Great-circle distance
The great-circle distance, also known as spherical or orthodromic distance, is the shortest distance between two points on a sphere's surface, measured along the great circle passing through them.
Greater-than sign
The greater-than sign (>) is a mathematical symbol indicating the value on its left exceeds the value on its right, first printed in Thomas Harriot's 1631 algebra book.
Greatest common divisor
The greatest common divisor, also known as the highest common factor, is the largest positive integer that divides two integers, found by the Euclidean algorithm from Euclid's Elements.
Greedy coloring
Greedy coloring, also called the first-fit algorithm, is a simple graph coloring method that processes vertices in a chosen order, giving each the smallest color its already-colored neighbors lack.
Greek letters used in mathematics, science, and engineering
Greek letters used in mathematics, science, and engineering are the 24 Greek alphabet letters used as symbols for quantities and constants, from π for the circle ratio to Σ for summation.
Green Bank Observatory
The Green Bank Observatory is a radio astronomy observatory in Green Bank, West Virginia, founded in 1956 and home to the 100-meter Green Bank Telescope.
Green Bank Telescope
The Green Bank Telescope is a 100-meter radio telescope in Green Bank, West Virginia, and the largest fully steerable radio telescope on Earth, dedicated in 2000.
Green chemistry
Green chemistry, also known as sustainable chemistry, is the design of chemical products and processes that reduce or eliminate the use and generation of hazardous substances.
Green Climate Fund
The Green Climate Fund is a multilateral climate fund created in 2010 under the UNFCCC and headquartered in Songdo, South Korea, to fund low-emission, climate-resilient development in developing countries.
Green flash
The green flash, also called the green ray, is a short-lived green brightening at the upper edge of the Sun at the horizon, usually lasting 1 to 2 seconds.
Green Light
Green light, 495–570 nm visible band (also cited as 510–565 nm), between cyan and yellow; detected by M-cones and 500-nm rhodopsin rods, absorbed ~80% by leaves, used in pain therapy and PPG heart-rate sensing.
Green New Deal
The Green New Deal is a family of policy proposals combining deep cuts in greenhouse gas emissions with job creation, best known from a 2019 US congressional resolution.
Green pea galaxy
A green pea galaxy is a small, compact star-forming galaxy that appears bright green in Sloan Digital Sky Survey images, first found by Galaxy Zoo volunteers in 2007.
Green River Formation
The Green River Formation is an Eocene rock unit in Wyoming, Utah, and Colorado, known for exceptionally preserved fossils and the largest oil shale resource on Earth.
Green rust
Green rust is a family of mixed Fe(II)–Fe(III) layered double hydroxide compounds, named in 1959, that form during iron corrosion and reduce contaminants such as nitrate and Cr(VI).
Green solvents
Green solvents are solvents chosen or designed to reduce environmental, health, and safety burdens compared with petroleum-derived solvents, forming a major focus of green chemistry.