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| Open AccessThe search for lunar mantle rocks exposed on the surface of the Moon
Vast, ancient impact basins scattered mantle materials across the lunar surface. We review lunar evolution models to identify candidate mantle lithologies, then assess orbital observations to evalutae the current distribution of these materials and implications for fundamental planetary processes.
- Daniel P. Moriarty III
- , Nick Dygert
- & Noah E. Petro
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Article
| Open AccessBadland landscape response to individual geomorphic events
The relative role of individual forcing events in long-term landscape evolution is challenging to measure in the field. Badlands offer special opportunities to quantify common, natural landscape dynamics on observational time scales.
- Ci-Jian Yang
- , Jens M. Turowski
- & Kuo-Jen Chang
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Article
| Open AccessUltrafast olivine-ringwoodite transformation during shock compression
Meteorites from space often include denser polymorphs of their minerals, providing records of past hypervelocity collisions. An olivine mineral crystal was shock-compressed by a high-power laser, and its transformation into denser ringwoodite was time-resolved using an X-ray free electron laser.
- Takuo Okuchi
- , Yusuke Seto
- & Norimasa Ozaki
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Article
| Open AccessThermohaline structure and circulation beneath the Langhovde Glacier ice shelf in East Antarctica
Basal melting of ice shelves is the principal driver of recent ice mass loss in Antarctica. The study reports comprehensive structures of temperature, salinity and current under an ice shelf in East Antarctica obtained by borehole measurements.
- Masahiro Minowa
- , Shin Sugiyama
- & Shigeru Aoki
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Article
| Open AccessFingerprinting the Cretaceous-Paleogene boundary impact with Zn isotopes
Elevated Zn isotope compositions occur in K-Pg sedimentary layers of three different depositional environments across North America and the Caribbean. The data indicate a volatilization event, and act as a robust mechanistic indicator of the meteorite impact at the end of the Cretaceous.
- Ryan Mathur
- , Brandon Mahan
- & Francisca E. Oboh-Ikuenobe
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Article
| Open AccessOut-of-sequence skeletal growth causing oscillatory zoning in arc olivines
Arc olivines are commonly explained through a paradigm of core-to-rim sequential growth and oscillatory zoning is interpreted to represent magma mixing. Here the authors show Fo–Ni–P oscillatory zoned olivines can grow as out-of-sequence crystal frames and complex zoning can occur in closed systems.
- Pablo Salas
- , Philipp Ruprecht
- & Osvaldo Rabbia
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Article
| Open AccessThe Great Oxygenation Event as a consequence of ecological dynamics modulated by planetary change
The Great Oxygenation Event (GOE) 2.4 billion years ago is believed to have been critical for the evolution of complex life. Here, Olejarz et al. propose a model suggesting that competition between major bacterial groups could have triggered the GOE in a feedback loop with geophysical processes.
- Jason Olejarz
- , Yoh Iwasa
- & Martin A. Nowak
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Article
| Open AccessGeneration of gravity waves from thermal tides in the Venus atmosphere
Gravity waves are observed in Venus atmosphere, but their characteristics are not well-known. Here, the authors show spontaneous generation of gravity waves from the thermal tides in the Venus atmosphere as small-scale gravity waves are resolved in high-resolution general circulation model.
- Norihiko Sugimoto
- , Yukiko Fujisawa
- & Yoshi-Yuki Hayashi
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Article
| Open AccessElectromagnetic power of lightning superbolts from Earth to space
Superbolts are powerful, rare lightning events. Here, the authors show simultaneous satellite and ground measurements of a superbolt, and demonstrate different properties of superbolts and lightnings.
- J.-F. Ripoll
- , T. Farges
- & S. Pédeboy
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Article
| Open AccessExploring the link between molecular cloud ices and chondritic organic matter in laboratory
Several scenarios exist to explain the origins of the organic matter found in carbonaceous chondrites. Here, the authors show laboratory experiments confirming that a significant portion of the soluble organic matter can originate from organic ices inherited from the dense molecular cloud.
- G. Danger
- , V. Vinogradoff
- & P. Schmitt-Kopplin
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Article
| Open AccessA tighter constraint on Earth-system sensitivity from long-term temperature and carbon-cycle observations
Earth-system sensitivity (ESS) describes the long-term temperature response for a given change in atmospheric CO2 and, as such, is a crucial parameter to assess future climate change. Here, the authors use a Bayesian model with data from the last 420 Myrs to reduce uncertainties and estimate ESS to be around 3.4 °C.
- Tony E. Wong
- , Ying Cui
- & Klaus Keller
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Article
| Open AccessIdentifying molecules as biosignatures with assembly theory and mass spectrometry
The search for life in the universe is difficult due to issues with defining signatures of living systems. Here, the authors present an approach based on the molecular assembly number and tandem mass spectrometry that allows identification of molecules produced by biological systems, and use it to identify biosignatures from a range of samples, including ones from outer space.
- Stuart M. Marshall
- , Cole Mathis
- & Leroy Cronin
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Article
| Open AccessThe kaolinite shuttle links the Great Oxidation and Lomagundi events
Expanded phosphorus availability possibly triggered a marine bioproduction boom after 2.3 billion years ago, but its delivery mechanisms remain unclear. Here we propose a kaolinite shuttle which efficiently adsorbs phosphorus in continental weathering settings and releases it under marine conditions.
- Weiduo Hao
- , Kaarel Mänd
- & Kurt O. Konhauser
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Article
| Open AccessReconciling metal–silicate partitioning and late accretion in the Earth
Through platinum metal-silicate partitioning coefficient measurements, the authors here show that platinum partitioning into metal is lowered at high pressure–temperature conditions. This finding implies that the Earth’s mantle was likely enriched in platinum immediately following the core-mantle differentiation.
- Terry-Ann Suer
- , Julien Siebert
- & Guillaume Fiquet
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Article
| Open AccessOxygen suppression of macroscopic multicellularity
The evolution of multicellular life is hypothesized to have been promoted by rising oxygen levels. Through experimental evolution and modeling, Bozdag et al. demonstrate that our planet’s first oxygenation would have strongly constrained, not promoted, the evolution of multicellular life.
- G. Ozan Bozdag
- , Eric Libby
- & William C. Ratcliff
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Article
| Open AccessOrigin of ammoniated phyllosilicates on dwarf planet Ceres and asteroids
The authors here propose a chemical reaction that forms ammoniated phyllosilicates on Ceres. This process could trigger at a very low temperature, suggesting Ceres evolution in a region different from its current location.
- Santosh K. Singh
- , Alexandre Bergantini
- & Ralf I. Kaiser
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Article
| Open AccessHydrodynamic instability at impact interfaces and planetary implications
The authors describe a dynamic surface instability between impacting materials, showing that a region of mixing grows between two media. The study implies that this can explain mixed compositions and textures in certain meteorites.
- Avi Ravid
- , Robert I. Citron
- & Raymond Jeanloz
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Article
| Open AccessUnusual polarimetric properties for interstellar comet 2I/Borisov
Polarimetry provides information about physical characteristics of cometary dust. Here, the authors show that the polarization of interstellar comet 2I/Borisov exceeds the typical values for comets, and this together with its polarimetrically homogenous coma suggests a more pristine nature of the object.
- S. Bagnulo
- , A. Cellino
- & M. Devogèle
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Article
| Open AccessIsotopic evidence for the formation of the Moon in a canonical giant impact
Here, the authors show that Earth and Moon are characterized by different vanadium isotope compositions, which is most likely resulting from vanadium isotope fractionation of the bulk silicate proto-Earth during the main stage of terrestrial core formation—followed by a canonical giant impact scenario, where 80% of the Moon originates from an impactor of chondritic composition.
- Sune G. Nielsen
- , David V. Bekaert
- & Maureen Auro
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Article
| Open AccessAmagmatic hydrothermal systems on Mars from radiogenic heat
Based on the analysis of chemical maps of Thorium and Potassium derived in the Eridania region on Mars, the authors show how radiogenic heat driven hydrothermal systems may have persisted on Mars.
- Lujendra Ojha
- , Suniti Karunatillake
- & Jacob Buffo
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Article
| Open AccessPhotolytic radical persistence due to anoxia in viscous aerosol particles
Sunlight can change the composition of atmospheric aerosol particles, but the mechanisms through which this happens are not well known. Here, the authors show that fast radical reaction and slow diffusion near viscous organic particle surfaces can cause oxygen depletion, radical trapping and humidity dependent oxidation.
- Peter A. Alpert
- , Jing Dou
- & Markus Ammann
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Article
| Open AccessImagining and constraining ferrovolcanic eruptions and landscapes through large-scale experiments
Ferrovolcanism is a hypothetical form of planetary volcanism in which the erupted lava is metallic in composition. Here we show that ferrovolcanic lava is denser and less viscous than silicate lava, resulting in fast-moving, thin, braided flows.
- A. Soldati
- , J. A. Farrell
- & J. A. Karson
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Article
| Open AccessLightning strikes as a major facilitator of prebiotic phosphorus reduction on early Earth
Determining the origins of life on Earth is confounded by the fact that the sources of nutrients necessary to create early life forms remain mysterious. Here the authors show that lightning strikes could have supplied a major source of essential phosphorus on early Earth.
- Benjamin L. Hess
- , Sandra Piazolo
- & Jason Harvey
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Article
| Open AccessActive methanogenesis during the melting of Marinoan snowball Earth
The deglaciation of Marinoan snowball Earth (~635 Myr ago) has been associated with potentially extensive CH4 emissions in relation to transient marine euxinia. Here, the authors find that active methanogenesis occurred during the termination of Marinoan snowball Earth, fueled by methyl sulfide production in sulfidic seawater.
- Zhouqiao Zhao
- , Bing Shen
- & Haoran Ma
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Article
| Open AccessImaging low-mass planets within the habitable zone of α Centauri
Imaging of low-mass exoplanets can be achieved once the thermal background in the mid-infrared (MIR) wavelengths can be mitigated. Here, the authors present a ground-based MIR observing approach enabling imaging low-mass temperate exoplanets around nearby stars.
- K. Wagner
- , A. Boehle
- & T. de Zeeuw
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Article
| Open AccessMelting and density of MgSiO3 determined by shock compression of bridgmanite to 1254GPa
The authors here report high melting temperatures of MgSiO3 at 500 GPa by direct shockwave loading of pre-synthesized dense bridgemanite. This is essential data to understand the thermal evolution of the interiors of terrestrial (exo-)planets.
- Yingwei Fei
- , Christopher T. Seagle
- & Michael D. Furnish
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Article
| Open AccessJarosite formation in deep Antarctic ice provides a window into acidic, water-limited weathering on Mars
The authors report in-situ formation of jarosite witin the Talos Dome ice core (East Antarctica) and show that this ferric-potassium sulfate mineral is present in ice deeper than 1000 meters and progressively increases with depth. This has implications for the presence and formation mechanisms of jarosite observed on Mars.
- Giovanni Baccolo
- , Barbara Delmonte
- & Massimo Frezzotti
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Article
| Open AccessDwarf planet (1) Ceres surface bluing due to high porosity resulting from sublimation
The origin of blue ejecta around the fresh craters of dwarf planet Ceres is unknown. Here, the authors show that the blue color results from high porosity of the surface, induced by sublimation of ice-phyllosilicate mixture produced by impacts.
- Stefan E. Schröder
- , Olivier Poch
- & Bernard Schmitt
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Article
| Open AccessBiomass burning aerosols in most climate models are too absorbing
Wildfires produce aerosols known to impact the climate, but the wider-reaching effects of this biomass burning are poorly constrained in models. Here the authors use a suite of observations from 12 campaigns around the globe to determine that the values used by most climate models overestimate the contribution of biomass burning aerosols.
- Hunter Brown
- , Xiaohong Liu
- & Duli Chand
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Article
| Open AccessSulfur monoxide dimer chemistry as a possible source of polysulfur in the upper atmosphere of Venus
Photochemistry of sulfur species in the upper Venus atmosphere is not well understood and the identity of ultraviolet (UV) absorber(s) remain unknown. Here, the authors show that sulfur monoxide dimer chemistry is a possible source of polysulfur, which could be responsible for the UV absorption.
- Joseph P. Pinto
- , Jiazheng Li
- & Yuk L. Yung
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Article
| Open AccessThe origin of the Moon’s Earth-like tungsten isotopic composition from dynamical and geochemical modeling
Tungsten isotopes between the Earth and Moon are compared in this new study. The authors find that traditional models of Moon formation are very unlikely to reproduce the Moon's Earth-like isotopic composition.
- Rebecca A. Fischer
- , Nicholas G. Zube
- & Francis Nimmo
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Article
| Open AccessLunar impact crater identification and age estimation with Chang’E data by deep and transfer learning
Using Chang’E data, the authors here identify more than 109,000 previously unrecognized lunar craters and date almost 19,000 craters based on transfer learning with deep neural networks. A new lunar crater database is derived and distributed to the planetary community.
- Chen Yang
- , Haishi Zhao
- & Ziyuan Ouyang
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Article
| Open AccessExtraterrestrial hexamethylenetetramine in meteorites—a precursor of prebiotic chemistry in the inner solar system
This manuscript tackles the origin of organic molecules in carbonaceous meteorites. Identifying hexamethylenetetramine in three carbonaceous meteorites, the authors propose formation from ammonia and formaldehyde by photochemical and thermal reactions in the interstellar medium, followed by the incorporation into planetary systems.
- Yasuhiro Oba
- , Yoshinori Takano
- & Shogo Tachibana
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Article
| Open AccessCarbonate-silicate cycle predictions of Earth-like planetary climates and testing the habitable zone concept
In the habitable zone concept, a planet’s carbon dioxide-water greenhouse maintains surface liquid water. Here, the authors estimate how many Earthlike exoplanets are needed to detect a relationship between stellar flux and the atmospheric carbon dioxide predicted by carbon cycle modeling.
- Owen R. Lehmer
- , David C. Catling
- & Joshua Krissansen-Totton
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Article
| Open AccessTesserae on Venus may preserve evidence of fluvial erosion
The authors here use Magellan data to interpret geomorphological features on Venus and present a strong hypothesis for fluvial erosion.
- S. Khawja
- , R. E. Ernst
- & L. M. MacLellan
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Article
| Open AccessBrightness modulations of our nearest terrestrial planet Venus reveal atmospheric super-rotation rather than surface features
Establishing diagnostics for terrestrial exoplanets are crucial for their characterization. Here, the authors show brightness modulations of Venus are caused by planetary-scale waves superimposed on the super-rotating winds can be used to detect existence of an atmosphere if detected at an exoplanet.
- Y. J. Lee
- , A. García Muñoz
- & S. Watanabe
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Article
| Open AccessSpace station biomining experiment demonstrates rare earth element extraction in microgravity and Mars gravity
Rare earth elements are used in electronics, but increase in demand could lead to low supply. Here the authors conduct experiments on the International Space Station and show microbes can extract rare elements from rocks at low gravity, a finding that could extend mining potential to other planets.
- Charles S. Cockell
- , Rosa Santomartino
- & René Demets
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Article
| Open AccessXenon iron oxides predicted as potential Xe hosts in Earth’s lower mantle
The abnormally low concentration of xenon compared to other noble gases in Earth’s atmosphere remains debated, as the identification of mantle minerals that can capture and stabilize xenon is challenging. Here, the authors propose that xenon iron oxides could be potential Xe hosts in Earth’s lower mantle.
- Feng Peng
- , Xianqi Song
- & Yanming Ma
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Article
| Open AccessEquatorial mountains on Pluto are covered by methane frosts resulting from a unique atmospheric process
Pluto is covered by numerous deposits of methane. Here, the authors show that the formation of methane frost on mountain tops and crater rims in Pluto’s equatorial regions completely differ from those forming snow-capped mountains on Earth.
- Tanguy Bertrand
- , François Forget
- & William M. Grundy
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Article
| Open AccessReconstructing the electrical structure of dust storms from locally observed electric field data
Electrification is naturally generated in dust storms but its structures remain largely unknown. Here, the authors present an inversion model to reconstruct such structures based on the locally observed electric field data, showing that dust storms exhibit a three-dimensional mosaic charge pattern.
- Huan Zhang
- & You-He Zhou
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Article
| Open AccessA transient enhancement of Mercury’s exosphere at extremely high altitudes inferred from pickup ions
Mercury has a global dayside exosphere that is very tenuous and does not extend far from the planet. Here, the authors show enhancement of neutral densities at high altitudes inferred from pickup ions that is most likely caused by the impact of a meteroid.
- Jamie M. Jasinski
- , Leonardo H. Regoli
- & Neil Murphy
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Article
| Open AccessStructural dynamics of basaltic melt at mantle conditions with implications for magma oceans and superplumes
Transport properties of melts in the deep Earth have dictated the evolution of the early Earth’s magma oceans and also govern many modern dynamic processes, such as plate tectonics. Here, the authors find there is a reversal in the trends of transport properties of basaltic melts at pressures near 50 GPa, with implications for the timescales of early Earth’s magma oceans.
- Arnab Majumdar
- , Min Wu
- & John S. Tse
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Article
| Open AccessPressure-stabilized divalent ozonide CaO3 and its impact on Earth’s oxygen cycles
Calcium and oxygen are abundant elements in the Earth’s mantle, largely present as calcium oxide. Here the authors show, by experiments and computations, that calcium ozonide (CaO3) is stabilized at the high pressures and temperatures characteristic of the lower mantle, with implications for the deep Earth’s chemistry.
- Yanchao Wang
- , Meiling Xu
- & Yanming Ma
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Article
| Open AccessThe varied sources of faculae-forming brines in Ceres’ Occator crater emplaced via hydrothermal brine effusion
The second extended phase of the Dawn mission provided high resolution observations of Occator crater of the dwarf planet Ceres. Here, the authors show that the central faculae were sourced in an impact-induced melt chamber, with a contribution from the deep brine reservoir, while the Vinalia Faculae were sourced by the deep brine reservoir alone.
- J. E. C. Scully
- , P. M. Schenk
- & C. T. Russell
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Article
| Open AccessImpact heat driven volatile redistribution at Occator crater on Ceres as a comparative planetary process
Dawn mission’s second extended phase provided high resolution observations of Occator crater of the dwarf planet Ceres. Here, the authors show stereo imaging and topographic maps of this crater revealing the influence of crustal composition on impact related melt and hydrothermal processes, and compare features to those on Mars, Earth and the Moon.
- P. Schenk
- , J. Scully
- & C. Raymond
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Article
| Open AccessDirect evidence of secondary reconnection inside filamentary currents of magnetic flux ropes during magnetic reconnection
Magnetic reconnection is a fundamental plasma process of magnetic energy conversion to kinetic energy. Here, the authors show direct evidence of secondary reconnection in the filamentary currents within the flux ropes indicating a significant contribution to energy conversion in the kinetic scale during turbulent reconnection.
- Shimou Wang
- , Rongsheng Wang
- & Shui Wang
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Article
| Open AccessPhosphorus-rich stars with unusual abundances are challenging theoretical predictions
Current models of Galactic chemical evolution under predict the phosphorus we observe in our Solar System. Here, the authors show the discovery of 15 phosphorus-rich stars with a peculiar abundance pattern that challenges the present stellar nucleosynthesis theoretical predictions, but which could explain the missing source of phosphorus in the Galaxy.
- Thomas Masseron
- , D. A. García-Hernández
- & Carlos Dafonte
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Article
| Open AccessPolypeptide formation in clusters of β-alanine amino acids by single ion impact
Formation of peptide bonds in cold gas-phase environments might represent a prebiotic synthesis route of polypeptides. Here, the authors show the formation of up to tetra-peptide species in the collision of He2+ ions, with kinetic energies typical for solar wind ions, with cold β-alanine clusters.
- Patrick Rousseau
- , Dariusz G. Piekarski
- & Bernd A. Huber
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Article
| Open AccessAsteroid shower on the Earth-Moon system immediately before the Cryogenian period revealed by KAGUYA
Ancient impact events on Earth are not well characterized due to continuous re-surfacing of Earth. Here, the authors study impact craters on the Moon with ages up to 800 million years ago and present a cross correlation to Earth, linking up to mass extinction events throughout Earth’s history.
- Kentaro Terada
- , Tomokatsu Morota
- & Mami Kato
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