Results 81 to 90 of about 1,344 (186)

Nanoscale space weathering features in mature lunar soil revealed by TEM and APT

Meteoritics &Planetary Science, Volume 61, Issue 8, Page 2048-2072, August 2026.
Abstract Space weathering significantly alters the optical, chemical, and structural properties of lunar regolith at micro‐ and nanoscales; yet detailed nanoscale variability within individual soils remains underexplored. Here we apply transmission electron microscopy (TEM) and atom probe tomography to four mineral grains (olivine, ilmenite, and two ...
Jennika Greer, Alexander M. Kling, Luke Daly, Dieter Isheim, David N. Seidman, Michelle S. Thompson, Philipp R. Heck   +6 more
wiley   +1 more source

Lunar ejecta as the missing piece to resolving lunar cratering asymmetry

Astronomy & Astrophysics
The leading-trailing asymmetry in lunar crater distribution provides a critical record of inner Solar System dynamics, yet the long-standing discrepancy between the observed higher asymmetry and lower theoretical predictions indicates a gap in our ...
Li Hailiang, Zhang Xiaoping, Zhou Li-Yong   +2 more
doaj   +1 more source

Impact provenance and age of a unique basalt found in Apollo 12 regolith

Meteoritics &Planetary Science, Volume 61, Issue 8, Page 2073-2085, August 2026.
Abstract Basaltic sample 12032,366‐18 from the Apollo 12 landing site is distinct among basalts collected at this site, other Apollo landing sites, and lunar meteorites in terms of its age, bulk rock composition, and isotopic composition. We present new Pb isotopic data obtained by in situ Secondary Ion Mass Spectrometry on multiple mineral phases in ...
C. Deligny, M. J. Whitehouse, R. E. Merle, H. Jeon, A. A. Nemchin, B. L. Jolliff   +5 more
wiley   +1 more source

Extending Māori Concepts in Secondary School Geography

New Zealand Geographer, Volume 82, Issue 2, August 2026.
ABSTRACT Secondary school geography brings together tāngata (people) and whenua (land), the central concepts of te ao Māori (the Māori world). Therefore, geography is ideally placed to respond to calls for mātauranga Māori (Māori knowledge) to gain “equal status” with Western knowledge.
Karen Finn, Hana Turner‐Adams, Melinda Webber   +2 more
wiley   +1 more source

Enhancement of Dayside Westward Electrojet: Triggering Conditions and Current Closures

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract Geomagnetic substorms are a major path for energy storage and release in the magnetosphere, which typically occur in the midnight sector with a strong enhancement of westward electrojets. However, by analyzing 37,940 events from a substorm list, about 3% of events unexpectedly initiated in the noon sector.
Haobo Fu, Chao Yue, Dedong Wang, Qiugang Zong, Huiting Feng, Yuri Shprits   +5 more
wiley   +1 more source

Statistical Evaluation of a Foreshock Transient Model Using Ground‐Based ULF Wave Observations

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract Hot flow anomalies and foreshock bubbles are discontinuity–driven foreshock transients that generate significant geospace disturbances. A recently developed analytical model can predict their upstream perturbations. In this study, we further evaluate this model by comparing its predictions with geomagnetic disturbances measured by ground‐based
Terry Zixu Liu, Vassilis Angelopoulos, Hui Zhang, Ying‐Dong Jia, Siqi Zhao   +4 more
wiley   +1 more source

Istihsan in Determination of the Lunar Month: Jurisprudential Flexibility for Harmonizing the Ummah

Sinthop
This article examines the role of Istihsan as a method of Islamic jurisprudential flexibility in determining Islamic law, particularly regarding the beginning of the lunar month, and reviews the positions of the four prominent schools of jurisprudence ...
Geubrina Rizky Ananda Sy, Nur Mahmudi Qiromi, Mahsun Mahsun, Amir Tajrid   +3 more
doaj   +1 more source

Direct observation of ion cyclotron damping of turbulence in Earth’s magnetosheath plasma

Nature Communications
Plasma turbulence plays a key role in space and astrophysical plasma systems, enabling the energy of magnetic fields and plasma flows to be transported to particle kinetic scales at which the turbulence dissipates and heats the plasma.
A. S. Afshari, G. G. Howes, J. R. Shuster, K. G. Klein, D. McGinnis, M. M. Martinović, S. A. Boardsen, C. R. Brown, R. Huang, D. P. Hartley, C. A. Kletzing   +10 more
doaj   +1 more source

JWST MIRI MRS Observations of T Cha: Discovery of a Spatially Resolved Disk Wind

The Astronomical Journal
Understanding when and how circumstellar disks disperse is crucial to constrain planet formation and migration. Thermal winds powered by high-energy stellar photons have long been theorized to drive disk dispersal.
Naman S. Bajaj, Ilaria Pascucci, Uma Gorti, Richard Alexander, Andrew Sellek, Jane Morrison, Andras Gaspar, Cathie Clarke, Chengyan Xie, Giulia Ballabio, Dingshan Deng   +10 more
doaj   +1 more source

Statistical Distribution Function of Orbital Spacings in Planetary Systems

The Astronomical Journal
The minimum orbital separation of planets in long-stable planetary systems is often modeled as a step function, parameterized with a single value ${{\rm{\Delta }}}_{\min }$ (measured in mutual Hill radius of the two neighboring planets).
Jeremy Dietrich, Renu Malhotra, Dániel Apai   +2 more
doaj   +1 more source