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Laboratory experiments show that the type of iron mineral is the dominant factor controlling the chlorate/perchlorate (ClO3−/ClO4−) generation ratio on Mars over oxidation methods or atmospheric composition. Chlorate yields are found to exceed perchlorate yields by orders of magnitude in the current desiccated Martian conditions.
The hydrogen isotopic composition of the oldest Solar System rocks demonstrates that a gaseous reservoir of terrestrial isotopic composition existed as early as the onset of Solar System formation and coexisted with the solar gas.
The rich transmission spectrum of exoplanet WASP-189 b reveals its dynamical atmosphere with a three-dimensional thermochemical stratification, requiring the unification of dynamical, thermal and chemical models for its study.
Supra-arcade downflows are dark finger-like structures associated with solar flares. Simulations now suggest that these plasma downflows form within a turbulent region that may control turbulent flows, electron currents and shockwaves.
To enable sub-arcsecond precision imaging of the radio sky, the Earth’s corrupting ionosphere must be corrected for. Here, the authors perform this challenging task, yielding a 6.6 deg2 field of view of the Lockman Hole field at sub-arcsecond resolution.
Massive black holes that are produced dynamically by black hole mergers are thought to involve eccentric orbits, whose imprint may remain in the gravitational waveform detected by the LIGO/Virgo Collaboration.
The episodic but protracted delivery of foundering cold material (diapirs) to the lunar core during the first billion years activated vigorous core convection that generated peaks of high intensity in the magnetic field. This process can explain the magnetic record of lunar rocks.
The 2,000-au-long streamer of material from binary protostar Z CMa can be explained by the flyby of an object some 4,700 au away, now revealed through high-spatial-resolution ALMA and JVLA observations.
Through an analysis of broad absorption lines in a range of quasars, quasar outflows are shown to have a negative global feedback effect on star formation, demonstrated by the recovery of star formation rates after the outflows disappear.
A Bayesian imaging method for reconstructing radio emission in spatial, temporal and spectral dimensions confirms the structures on the time-varying emission ring of M87* observed by the Event Horizon Telescope, and identifies additional features.