Astronomical Dictionary on Letter #T

Tectonic

Relating to the deformation of the crust of a moon or planet, the forces involved in or producing su...

Terminator

The line separating the illuminated and unilluminated parts of a celestial body; the dividing line b...

Transit

The apparent journey of Mercury or Venus across the Sun's disc, or of a planet's moon across the dis...

Terrestrial

Belonging to the class of planets that are similar to the Earth in density and composition (i.e. Mer...

Tethys

In Greek mythology, a sea goddess....

Theia

Pre-Hellenic goddess of light, mother of the dawn. In Greek mythology, mother of Helios (the Sun) an...

Titan

In Greek mythology, Titans were the firstborn children of Uranus (the sky) and Gaea (the Earth). The...

Topography

The shape and form of the surface of a planet....

Triton

In Greek mythology, merman, half-man, half-fish. Son of Poseidon and Amphitrite....

Trough

A long linear depression....