- tectonic
- deformation forces acting on a planet's crust.
- terminator
- the dividing line between the illuminated and the
unilluminated part of the moon's or a planet's disk.
- terra
- extensive land mass.
- tessera
- tile; terrain formed of polygonal pattern
- tholus
- small domical mountain or hill.
- Thomson, William
1824-1907
- aka Lord Kelvin, British physicist who developed
the Kelvin scale of
temperature. Also supervised the laying of a
trans-Atlantic cable.
- tidal heating
- frictional heating of a satellite's interior due
to flexure caused by the gravitational pull of
its parent planet and possibly neighboring
satellites.
- Tombaugh, Clyde
1906-1997
- American astronomer; discovered Pluto.
- Trekkie
- (also "Trekker") a devotee of the
science fiction program Star Trek.
- Trojan
- an object orbiting in the Lagrange points of
another (larger) object. This name derives from a
generalization of the names of some of the
largest asteroids in Jupiter's
Lagrange points: 588 Achilles, 624 Hektor, and
911 Agamemmnon. Saturn's
satellites Helene, Calypso and Telesto are also
sometimes called Trojans.
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