Thermal expansion and thermal stress in the moon and terrestrial planets - Clues to early thermal history

Physics

Scientific paper

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Lunar Temperature, Planetary Evolution, Planetary Temperature, Thermal Expansion, Lunar Surface, Mars Surface, Mercury (Planet)

Scientific paper

The paper discusses how features of the surface geology of the moon and also Mars and Mercury impose constraints on the volumetric expansion or contraction of a planet and consequently provide a test of thermal history models. The moon has changed very little in volume over the last 3.8 b.y. Thermal models satisfying this constraint involve early heating and perhaps melting of the outer 200 km of the moon and an initially cold interior. Mercury has contracted by about 2 km in radius since emplacement of its present surface, so core formation must predate that surface. A hot initial temperature distribution is implied.

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