Tectonic
Relating to the deformation of the crust of a moon or planet, the forces involved in or producing such deformation, and the resulting forms.
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Category: Astronomical
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Terminator
The line separating the illuminated and unilluminated parts of a celestial body; the dividing line between day and night as observed from a distance.
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Category: Astronomical
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Transit
The apparent journey of Mercury or Venus across the Sun's disc, or of a planet's moon across the disc of its parent.
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Category: Astronomical
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Terrestrial
Belonging to the class of planets that are similar to the Earth in density and composition (i.e. Mercury, Venus, and Mars).
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Category: Astronomical
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Tethys
In Greek mythology, a sea goddess.
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Category: Astronomical
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Theia
Pre-Hellenic goddess of light, mother of the dawn. In Greek mythology, mother of Helios (the Sun) and Eos (the Dawn).
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Category: Astronomical
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Titan
In Greek mythology, Titans were the firstborn children of Uranus (the sky) and Gaea (the Earth). The ruler of the Titans was Cronos, whose Roman name is Saturn.
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Category: Astronomical
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Topography
The shape and form of the surface of a planet.
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Category: Astronomical
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Triton
In Greek mythology, merman, half-man, half-fish. Son of Poseidon and Amphitrite.
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Category: Astronomical
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Trough
A long linear depression.
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Category: Astronomical
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