Results 91 to 100 of about 186,974 (222)

Substitution of Fe3+ into anorthite in oxidized, Al‐deficient ferrobasaltic systems with implications for the petrogenesis of angrite meteorites

Meteoritics &Planetary Science, Volume 61, Issue 3, Page 427-443, March 2026.
Abstract Angrite meteorites are critically silica‐undersaturated igneous rocks with high Ca/Al and Fe/Mg, along with depletion in volatile lithophile elements Na and K such that they crystallize anorthite along with olivine and calcic pyroxene. The anorthite in angrites contains substantial Fe, and in NWA 1670 and NWA 1296, it is present at major ...
Seann J. McKibbin, Dominique Tanner, Hugh St. C. O'Neill   +2 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

Freeze‐Thaw Cycling Accelerated Olivine Weathering and Water Sequestration on Icy Mars

Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.
Abstract Geological evidence and paleoclimate models suggest that freeze‐thaw (FT) cycling has played a pivotal role in shaping the Martian surface composition throughout geological time. Here we show the experimental investigation of the sulfuric acid weathering of olivine under simulated FT conditions (193–293 K).
Jing Liu, Jing Wang, Shouhao Tong, Mengqi Luo, Junming Zhou, Jiacheng Liu, Zhongchen Wu, Minwang Laipan, Runliang Zhu   +8 more
wiley   +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

LUNAR ECLIPSE COMPUTATION IN INDIAN ASTRONOMY WITH SPECIAL REFERENCE TO SIDDHNTIC TEXTS

Publications of The Korean Astronomical Society, 2015
Indian astronomical texts have records of lunar astronomy since the Puranic age. In the VedngaJyotia (1350 B CE), the algorithm for computing eclipses is not found. This phenomenon was interpretedin the Siddhntic texts as the occurrence of Vyatipati Yoga.
openaire   +2 more sources

Impact of Annually Variable Dust Activity on the Recession of the Martian South Polar Seasonal Cap

The Astronomical Journal
Suspended dust is a vital component of Martian climatic system and its temporal-spatial variation can influence the recession of the South Polar Seasonal Cap (SPSC).
Zhibin Li, Jianjun Liu, Renhao Tian, Zhaopeng Chen, Qing Zhang, Jingjing Zhang, Wei Yan, Qiang Fu, Shaoran Liu, Nannan Ma   +9 more
doaj   +1 more source

Pixel-level Terrain Processing of the Martian Surface from Moderate Resolution Images of Tianwen-1

The Astronomical Journal
The moderate-resolution camera (MoRIC) of the Tianwen-1 orbiter, China’s first Mars exploration mission, is a frame-imaging scheme color camera. However, generating a precise digital elevation model (DEM) from these images faces challenges due to the ...
Dingxin Liu, Wei Yan, Jianjun Liu, Xingguo Zeng, Wangli Chen, Xin Ren   +5 more
doaj   +1 more source

Dirt, Gravity, and Lunar-Based Telescopes: The Value Proposition for Astronomy

, 2007
The lunar surface has historically been considered an optimal site for a broad range of astronomical telescopes. That assumption, which has come to be somewhat reflexive, is critically examined in this paper and found to be poorly substantiated. The value of the lunar surface for astronomy may be broadly compelling only in comparison to terrestrial ...
openaire   +2 more sources