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The rotational stability of an ice-age earth
SUMMARY Predictions of glaciation-induced changes in the Earth’s rotation vector exhibit sensitivities to Earth structure that are unique within the suite of long-wavelength observables associated…
Evidence for an ancient martian ocean in the topography of deformed shorelines
It is shown that the long-wavelength topography of the shorelines is consistent with deformation caused bytrue polar wander—a change in the orientation of a planet with respect to its rotation pole—and that the inferred pole path has the geometry expected for a true polar wander event that postdates the formation of the massive Tharsis volcanic rise.
Lunar interior properties from the GRAIL mission
The Gravity Recovery and Interior Laboratory (GRAIL) mission has sampled lunar gravity with unprecedented accuracy and resolution. The lunar GM, the product of the gravitational constant G and the…
Late Tharsis formation and implications for early Mars
The rotational figure of Mars (that is, its equilibrium shape) and its surface topography before Tharsis formed, when the spin axis of the planet was controlled by the difference in elevation between the northern and southern hemispheres (hemispheric dichotomy), is calculated.
Viscous Diffusion and Photoevaporation of Stellar Disks
The evolution of a stellar disk under the influence of viscous evolution, photoevaporation from the central source, and photoevaporation by external stars is studied. We take the typical parameters…
Ancient Igneous Intrusions and Early Expansion of the Moon Revealed by GRAIL Gravity Gradiometry
The Moon's gravity map shows that the crust is cut by extensive magmatic dikes, perhaps implying a period of early expansion, and application of gravity gradiometry to observations by the GRAIL mission results in the identification of a population of linear gravity anomalies with lengths of hundreds of kilometers.
Gravity and tectonic patterns of Mercury: Effect of tidal deformation, spin‐orbit resonance, nonzero eccentricity, despinning, and reorientation
 We consider the effect of spin-orbit resonance, nonzero eccentricity, despinning, and reorientation on Mercury's gravity and tectonic pattern. Large variations of the gravity and shape…
Tectonic patterns on reoriented and despun planetary bodies
Reorientation and faulting of Pluto due to volatile loading within Sputnik Planitia
It is reported that the location of Sputnik Planitia is the natural consequence of the sequestration of volatile ices within the basin and the resulting reorientation (true polar wander) of Pluto.