| Ganymede |
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proper noun
- (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.
- (astronomy) A moon of Jupiter.
- A servant boy or young waiter, particularly one who serves liquor.
- A boy kept for pederastic purposes; a catamite.
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| Gemini |
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proper noun
- (constellation): A constellation of the zodiac supposedly shaped like a pair of twins. It contains the stars Castor and Pollux.
- (astrology): The Zodiac sign for the twins, covering May 22 - June 21.
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| Giant |
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proper noun
- (baseball) A player on the team the "San Francisco Giants".
- A player on the team the "New York Giants".
Giants
- (baseball) The team w:San Francisco Giants, The San Francisco Giants.
- The team w:New York Giants, The New York Giants.
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| gibbous |
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adjective
- Characterized by convex, convexity; protuberant.
- (astronomy) Phase of moon between first quarter and full or between full and last quarter.
- humpback, Humpbacked.
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| globular cluster |
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noun
- (astronomy) a spherical star cluster containing thousands to millions of stars
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| globule |
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noun
- A small round particle of substance; a drop.
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| gnomon |
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noun
- The pointer on a sundial.
- (geometry) A plane figure formed by removing a parallelogram from a corner of a larger parallelogram.
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| granulation |
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noun - The act or process of forming or crystallizing into grains; as, the granulation of powder and sugar.
- The state of being granulated.
- 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.
- The act or process of the formation of such prominences.
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| gravitational collapse |
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noun
- 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
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| gravitational lens |
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noun
- (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.
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| Great Bear |
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proper noun great, Great bear, Bear
- (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.
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| Great Red Spot |
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proper noun great, Great red, Red spot, Spot
- a giant anticyclonic storm on the planet Jupiter; first observed about 1665
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| Grus |
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proper noun
- (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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