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Glossary of Astronomy Terms
beginning with letter G
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Ganymede Tweet Definition of Ganymede Like Definition of Ganymede on Facebook
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 Tweet Definition of Gemini Like Definition of Gemini on Facebook
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 Tweet Definition of Giant Like Definition of Giant on Facebook
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 Tweet Definition of gibbous Like Definition of gibbous on Facebook
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 Tweet Definition of globular cluster Like Definition of globular cluster on Facebook
noun
  1. (astronomy) a spherical star cluster containing thousands to millions of stars
globule Tweet Definition of globule Like Definition of globule on Facebook
noun
  1. A small round particle of substance; a drop.
gnomon Tweet Definition of gnomon Like Definition of gnomon on Facebook
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 Tweet Definition of granulation Like Definition of granulation on Facebook
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 Tweet Definition of gravitational collapse Like Definition of gravitational collapse on Facebook
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 Tweet Definition of gravitational lens Like Definition of gravitational lens on Facebook
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 Tweet Definition of Great Bear Like Definition of Great Bear on Facebook
proper noungreat, 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 Tweet Definition of Great Red Spot Like Definition of Great Red Spot on Facebook
proper noungreat, Great red, Red spot, Spot
  1. a giant anticyclonic storm on the planet Jupiter; first observed about 1665
Grus Tweet Definition of Grus Like Definition of Grus on Facebook
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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