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Glossary of Astronomy Terms
beginning with letter G
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Ganymede
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proper noun
  1. (Greek mythology) A Trojan boy who was abducted (either by Zeus or Eos), and ultimately became immortal in order to be Zeus' cup-bearer and lover.
  2. (astronomy) A moon of Jupiter.
  3. A servant boy or young waiter, particularly one who serves liquor.
  4. A boy kept for pederastic purposes; a catamite.
Gemini
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proper noun
  1. (constellation): A constellation of the zodiac supposedly shaped like a pair of twins. It contains the stars Castor and Pollux.
  2. (astrology): The Zodiac sign for the twins, covering May 22 - June 21.
Giant
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proper noun
  1. (baseball) A player on the team the "San Francisco Giants".
  2. A player on the team the "New York Giants".
Giants
  1. (baseball) The team w:San Francisco Giants, The San Francisco Giants.
  2. The team w:New York Giants, The New York Giants.
gibbous
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adjective
  1. Characterized by convex, convexity; protuberant.
  2. (astronomy) Phase of moon between first quarter and full or between full and last quarter.
  3. humpback, Humpbacked.
globular cluster
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noun
  1. (astronomy) a spherical star cluster containing thousands to millions of stars
globule
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noun
  1. A small round particle of substance; a drop.
gnomon
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noun
  1. The pointer on a sundial.
  2. (geometry) A plane figure formed by removing a parallelogram from a corner of a larger parallelogram.
granulation
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noun
  1. The act or process of forming or crystallizing into grains; as, the granulation of powder and sugar.
  2. The state of being granulated.
  3. One of the small, red, grainlike prominences which form on a raw surface (that of wounds or ulcers), and are the efficient agents in the process of healing.
  4. The act or process of the formation of such prominences.
gravitational collapse
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noun
  1. the stage in the evolution of a star in which the pressure of the star is insufficient to maintain it at a stable size, and its material falls inward under its own gravitational attraction, eventually forming a black hole or a neutron star, and sometimes accompanied by a supernova explosion
gravitational lens
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noun
  1. (astronomy) A massive body that produces distorted, magnified or multiple images of more distant objects when its gravitational field bends the path of light rays.
Great Bear
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proper noun great, Great bear, Bear
  1. (constellation): A bright circumpolar asterism of the northern sky, said to resemble a large bear. It is part of the constellation Ursa Major and includes the stars Mizar, Dubhe, and Alkaid.
Great Red Spot
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proper noun great, Great red, Red spot, Spot
  1. a giant anticyclonic storm on the planet Jupiter; first observed about 1665
Grus
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proper noun
  1. (constellation) A spring constellation of the southern sky, said to resemble a crane. It contains the star Alnair and lies south of the constellation Piscis Austrinis.
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