Featured
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News & Views |
Don’t judge the Moon’s interior by its cover
The Moon’s primordial solidification is believed to have produced a layer of dense ilmenite cumulates beneath the crust. Remnants of this layer have now been detected under the lunar nearside.
- Peter B. James
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Article |
Vestiges of a lunar ilmenite layer following mantle overturn revealed by gravity data
The Moon’s gravity field preserves a record of the overturn of the early lunar mantle and sinking of dense ilmenite-bearing cumulates, according to a comparison of Gravity Recovery and Interior Laboratory gravity data and geodynamic models.
- Weigang Liang
- , Adrien Broquet
- & Alexander J. Evans
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Article
| Open AccessTitanium-rich basaltic melts on the Moon modulated by reactive flow processes
Petrological reaction experiments and magnesium isotope data suggest that reactive flow with mantle cumulates can explain the composition of Ti-rich basaltic magmas.
- Martijn Klaver
- , Stephan Klemme
- & Tim Elliott
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Matters Arising |
Reply to: No 182W evidence for early Moon formation
- Maxwell Marzban Thiemens
- , Jonas Tusch
- & Carsten Münker
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Article
| Open AccessPossible link between Earth’s rotation rate and oxygenation
Rotational deceleration has increased daylength on Earth, potentially linking the increased burial of organic carbon by cyanobacterial mats and planetary oxygenation, according to experiments and modelling of Precambrian benthic ecosystems.
- J. M. Klatt
- , A. Chennu
- & G. J. Dick
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Article |
A pole-to-equator ocean overturning circulation on Enceladus
Enceladus’s interior ocean could sustain a pole-to-equator overturning circulation, which might mean its bulk salinity is greater than that estimated from plume sampling by Cassini, according to numerical simulations.
- Ana H. Lobo
- , Andrew F. Thompson
- & Saikiran Tharimena
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Article |
Implantation of Martian atmospheric ions within the regolith of Phobos
Martian atmospheric atoms are implanted in and alter regolith grains on the nearside surface of Phobos, according to an analysis of observations of ion escape from Mars’s atmosphere.
- Q. Nénon
- , A. R. Poppe
- & J. P. McFadden
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Article |
Early crust building enhanced on the Moon’s nearside by mantle melting-point depression
Early magmatism on the Moon’s nearside may have been enhanced by a geochemical anomaly lowering the melting point of the mantle source region, according to high-temperature experiments and thermal numerical modelling.
- Stephen M. Elardo
- , Matthieu Laneuville
- & Charles K. Shearer
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Article |
Distinct oxygen isotope compositions of the Earth and Moon
High-precision measurements suggest that the Earth and Moon have distinct oxygen isotope compositions. This implies distinct oxygen isotopic compositions of the proto-Earth and its impactor that were not fully homogenized by the Moon-forming impact.
- Erick J. Cano
- , Zachary D. Sharp
- & Charles K. Shearer
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Matters Arising |
Reply to: Penitente formation is unlikely on Europa
- Daniel E. J. Hobley
- , Jeffrey M. Moore
- & Orkan M. Umurhan
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Editorial |
The familiarity of icy worlds
The geological similarities between icy and rocky worlds invite comparison and cross-fertilization of knowledge.
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Article |
Possible explosion crater origin of small lake basins with raised rims on Titan
Some lake basins in the polar regions of Titan may be craters from nitrogen vapour explosions due to past warming, according to analysis of their morphology in comparison to terrestrial explosion craters from magma–water interaction.
- Giuseppe Mitri
- , Jonathan I. Lunine
- & Valerio Poggiali
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Article |
Tin isotopes indicative of liquid–vapour equilibration and separation in the Moon-forming disk
Vigorous mixing between the protolunar disk and Earth followed by processes in the cooling disk may explain the enrichment in light isotopes of tin on the Moon relative to Earth, as found by analysis of lunar rocks and geochemical calculations.
- Xueying Wang
- , Caroline Fitoussi
- & Sébastien Charnoz
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Article |
Abundance of highly siderophile elements in lunar basalts controlled by iron sulfide melt
The abundance of iron-loving elements in Moon rocks cannot indicate the amount of late accretion onto the Moon, according to experiments and thermodynamic calculations constraining the behaviour of these elements under lunar mantle conditions.
- James M. Brenan
- , James E. Mungall
- & Neil R. Bennett
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Article |
Early Moon formation inferred from hafnium–tungsten systematics
The Moon formed around 50 Myr after the Solar System, suggests a lunar silicate Hf/W ratio higher than that of Earth, from high-precision compositional analysis of lunar rock samples.
- Maxwell M. Thiemens
- , Peter Sprung
- & Carsten Münker
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Article |
Thick ice deposits in shallow simple craters on the Moon and Mercury
Ice deposits up to around 50 m thick infill some craters near the Moon’s south pole and Mercury’s north pole, as inferred from the poleward shallowing of simple craters.
- Lior Rubanenko
- , Jaahnavee Venkatraman
- & David A. Paige
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News & Views |
Why the Moon is so like the Earth
The Moon’s isotopic composition is uncannily similar to Earth’s. This may be the signature of a magma ocean on Earth at the time of the Moon-forming giant impact, according to numerical simulations.
- H. Jay Melosh
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Article |
Terrestrial magma ocean origin of the Moon
Moon formation by a giant impact ejecting material from a magma ocean on Earth reconciles geochemical and dynamical constraints on its formation, according to numerical simulations.
- Natsuki Hosono
- , Shun-ichiro Karato
- & Takayuki R. Saitoh
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News & Views |
To sink or swim in Titan’s lakes
Flotation of aerosols as a film on the hydrocarbon lakes of Saturn’s moon Titan may explain the lakes’ stillness, and could influence the atmospheric hydrocarbon cycle.
- Isabelle Couturier-Tamburelli
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Article |
The floatability of aerosols and wave damping on Titan’s seas
Organic aerosols that sediment from Titan’s atmosphere may float, form a film and damp waves on Titan’s seas, according to computations. This damping effect could explain the observed smoothness of Titan’s seas.
- Daniel Cordier
- & Nathalie Carrasco
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Article |
Lunar soil hydration constrained by exospheric water liberated by meteoroid impacts
Water is uniformly present at low concentrations in the Moon’s subsoil and is emitted by meteoroid impacts, according to analysis of water releases detected by NASA’s Lunar Atmosphere and Dust Environment Explorer.
- M. Benna
- , D. M. Hurley
- & R. C. Elphic
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Article |
Formation of metre-scale bladed roughness on Europa’s surface by ablation of ice
Sublimation rates of water ice in equatorial regions of Jupiter’s moon Europa are sufficient to sculpt bladed terrain that would pose a hazard to a potential lander mission.
- Daniel E. J. Hobley
- , Jeffrey M. Moore
- & Orkan M. Umurhan
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Article |
Observational evidence for active dust storms on Titan at equinox
Saturn’s moon Titan may have an active dust cycle in equatorial regions driven by storm winds, Cassini observations consistent with dust suspension in Titan’s atmosphere suggest.
- S. Rodriguez
- , S. Le Mouélic
- & P. D. Nicholson
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Review Article |
A post-Cassini view of Titan’s methane-based hydrologic cycle
The Cassini mission revealed the complex workings of Titan’s methane-based hydrologic cycle over a range of timescales, providing a potential window into the future of Earth and its water cycle.
- Alexander G. Hayes
- , Ralph D. Lorenz
- & Jonathan I. Lunine
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Comment |
Exploring ocean worlds on Earth and beyond
The exploration of ocean worlds in the outer Solar System offers the opportunity to search for an independent origin of life, and also to advance our capabilities for exploring and understanding life in Earth’s oceans.
- Kevin Peter Hand
- & Christopher R. German
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News & Views |
Bypassing the habitable zone
In our own solar system, Venus is too hot, Mars is too cold and Earth is just right. Simulations show that making an icy planet habitable is not as simple as melting its ice: many icy bodies swing from too cold to too hot, bypassing just right.
- Andrew P. Ingersoll
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Article |
Abrupt climate transition of icy worlds from snowball to moist or runaway greenhouse
Icy planets and moons could become habitable as their host stars brighten and their ice melts. Climate simulations instead show a rapid transition from a snowball to an inhospitable greenhouse climate with significant water loss.
- Jun Yang
- , Feng Ding
- & Yonggang Liu
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Article |
Electrification of sand on Titan and its influence on sediment transport
Frictional charging of granular materials may readily occur on Saturn’s moon Titan. Laboratory experiments under Titan-like conditions suggest that the resulting electrostatic forces are strong enough to affect sand transport on Titan.
- J. S. Méndez Harper
- , G. D. McDonald
- & J. J. Wray
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Article |
An ongoing satellite–ring cycle of Mars and the origins of Phobos and Deimos
The moon Phobos is spiralling inwards towards its disintegration to eventually form a ring around Mars from which new moons may form. Simulations suggest that this is just the latest of multiple ring–moon cycles over the history of Mars.
- Andrew J. Hesselbrock
- & David A. Minton
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News & Views |
Punch combo or knock-out blow?
The twin isotopic signatures of the Moon and Earth are difficult to explain by a single giant impact. Impact simulations suggest that making the Moon by a combination of multiple, smaller moonlet-forming impacts may work better.
- Gareth S. Collins
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Article |
A multiple-impact origin for the Moon
A giant impact has been proposed as being responsible for forming the Moon, but scenarios that match existing constraints are improbable. Numerical modelling now suggests that instead a series of smaller and more common impacts can explain the Earth–Moon system.
- Raluca Rufu
- , Oded Aharonson
- & Hagai B. Perets
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Letter |
Evidence for a dynamic nanodust cloud enveloping the Moon
The Moon has a tenuous exosphere and dust-sized particles have been detected. Analysis of spectral observations by the LADEE spacecraft suggests that the Moon also has a spatially and temporally variable exosphere of nanodust particles.
- D. H. Wooden
- , A. M. Cook
- & M. Shirley
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News & Views |
Rise and fall of the Martian moons
The two small satellites of Mars are thought to have accreted from a debris disk formed in a giant impact. Simulations suggest the moons were shepherded into formation by the dynamical influence of one or more short-lived massive inner moons.
- Erik Asphaug
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Letter |
Accretion of Phobos and Deimos in an extended debris disc stirred by transient moons
Mars has two small moons that may have formed in the aftermath of a giant impact. Simulations suggest that Phobos and Deimos accreted from the disperse outer region of the debris disc that was stirred up by short-lived larger moons.
- Pascal Rosenblatt
- , Sébastien Charnoz
- & Stéven Toupin
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Commentary |
Cassini's Grand Finale
After more than a decade exploring Saturn and its moons, the Cassini mission is in its closing act. Cassini's last year is an encore performance stuffed with science, including a final plunge into Saturn's atmosphere.
- Scott G. Edgington
- & Linda J. Spilker
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Letter |
Mountain building on Io driven by deep faulting
The high relief on Jupiter’s moon Io has been linked to compression due to global subsidence. Simulations show that Io’s mountains may form along thrust faults that initiate at the lithosphere’s base where the compressive stresses are highest.
- Michael T. Bland
- & William B. McKinnon
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Perspective |
The demise of Phobos and development of a Martian ring system
The moon Phobos will eventually either disintegrate to form a ring or crash into Mars. Observational constraints and geotechnical considerations suggest that Phobos will partially break apart into a ring, with stronger fragments impacting Mars.
- Benjamin A. Black
- & Tushar Mittal
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News & Views |
Cooking up the Moon in two steps
Compared to Earth, the Moon is depleted in volatile species like water, sodium and potassium. Simulations suggest that much of the Moon formed from hot, volatile-poor melt in a disk of debris after initially amassing cooler, volatile-rich melt.
- Steve Desch
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Letter |
Lunar volatile depletion due to incomplete accretion within an impact-generated disk
The Moon may have accreted from a disk of debris after a giant impact. Simulations suggest that part of the Moon derives from volatile-poor melt in the hot inner disk, with most of the volatile elements condensing later and accreting to Earth.
- Robin M. Canup
- , Channon Visscher
- & Bruce Fegley Jr
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News & Views |
Shepherds of Saturn's ring
Saturn's F ring is chaperoned on both sides by the tiny moons Prometheus and Pandora. Numerical simulations show that this celestial ballet can result from the collision of two aggregates that evolved out of Saturn's main rings.
- Aurélien Crida
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Letter |
Saturn’s F ring and shepherd satellites a natural outcome of satellite system formation
Lying beyond Saturn’s main rings, the F ring is shepherded by two small satellites. Simulations suggest that this enigmatic configuration can result from the partial disruption of satellites in collisions at the edge of the main ring system.
- Ryuki Hyodo
- & Keiji Ohtsuki
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Letter |
Timing of water plume eruptions on Enceladus explained by interior viscosity structure
Water plume eruptions on Saturn’s icy moon Enceladus are delayed relative to the peak tidal stresses. Simulations suggest the delay can be explained by the moon’s interior structure and the presence of a subsurface ocean.
- Marie Běhounková
- , Gabriel Tobie
- & Francis Nimmo
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Editorial |
Planetary rite of spring
Research on the Solar System's planets has moved beyond fly-by science. Long-term observations of planetary bodies can yield insights as the days, seasons and years pass.
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News & Views |
Stormy origins of Titan's dunes
Titan's equatorial dunes seem to move in the opposite direction to the prevailing easterly winds. Infrequent methane storms at Titan's low latitudes may briefly couple surface winds to fast westerlies above, dominating the net movement of sand.
- Claire Newman