An extra solar planetary system with three Neptune-mass planets

Article Abstract:

A system of three Neptune-mass planets with periods of 8.67, 31.6, and 197 days, orbiting the nearby star HD 69830 is reported. Simulations show that the system is in a dynamically stable configuration and this star is already known to show an infrared excess possibly caused by an asteroid belt within 1 AU (the Sun-Earth distance).

Neptune (Planet), Extrasolar planets, Planetary systems

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Recent ice-rich deposits formed at high latitudes on Mars by sublimation of unstable equatorial ice during low obliquity

Article Abstract:

Ice concentrations in high latitudes of both martian hemispheres were found by the Mars Odyssey spacecraft. Ice accumulation rates estimated from global climate model simulations show large variations of Mars obliquity that have allowed the formation of sedimentary layered deposits in high latitude and polar regions.

France, Environmental aspects, Mars (Planet), Climatic changes, Climate change, Polar regions

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Mercury's capture into the 3/2 spin-orbit resonance as a result of its chaotic dynamics

Article Abstract:

Mercury rotates three times on its axis for every two orbits around the sun. It is due to the fact that Mercury is locked into a 3/2 spin-orbit resonance and the understanding of how this state initially arose is stated.

Mercury (Planet)

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