The composition the atmosphere of Venus results from the integration of many processes
entering into play over the entire geological history of the planet. Determining the elemental …

Earth's water, intrinsic oxidation state and metal core density are fundamental chemical
features of our planet. Studies of exoplanets provide a useful context for elucidating the …

The timing of formation of the Mars atmosphere controlled the early climate and its
subsequent evolution. We examine this timing through the role played in atmospheric …

Noble gases provide tracers of cosmic provenance that are accessible to a future Uranus
atmospheric probe. Argon and krypton are expected to be well mixed on Uranus with …

The deuterium-to-hydrogen (D/H or 2 H/1 H) ratio of Martian atmospheric water (∼ 6×
standard mean ocean water, SMOW) is higher than that of known sources, requiring …

Martian meteorites are key for assessing the isotopic characteristics of nitrogen in different
martian reservoirs (ie, mantle, crust, and atmosphere), and, ultimately, for constraining the …

We develop a new model of diffusively modulated hydrodynamic escape to predict oxygen
isotopic fractionations caused by the loss of water from a steam atmosphere of Venus. The …

Accretion of volatile elements is a critical step to make a planet habitable. It is often assumed
that terrestrial planets initially captured solar gases from the nebula, which are partially …

In the last few years astronomical surveys have expanded the reach of planetary science
into the realm of small and dense extrasolar worlds. These share a number of characteristics …

Context. The origin of water, particularly on Earth, is still a matter of heated debate. To date,
the most widespread scenario is that the Earth originated without water and that it was …