Results 41 to 50 of about 296,727 (213)

Interstellar Object 3I/ATLAS Observed from Mars by China’s Tianwen-1 Spacecraft

open access: yesThe Astrophysical Journal Letters
China’s Tianwen-1 Mars orbiter successfully imaged the third interstellar object, 3I/ATLAS, during its close encounter with Mars using the onboard HiRIC CMOS camera. This is China’s first deep-space observation of an astronomical object.
Xin Ren   +22 more
doaj   +1 more source

Six Outbursts of Comet 46P/Wirtanen

open access: yesThe Planetary Science Journal, 2021
Cometary activity is a manifestation of sublimation-driven processes at the surface of nuclei. However, cometary outbursts may arise from other processes that are not necessarily driven by volatiles.
Michael S. P. Kelley   +37 more
doaj   +1 more source

Geochemical and granulometric fingerprints of 8200 years of westerly wind variability in inner‐fjord lake sediments from Svalbard

open access: yesBoreas, EarlyView.
The Arctic is warming faster than any other region on Earth. As sea ice diminishes, the surface boundary conditions, such as roughness and air–sea coupling, change and open‐water fetch increases. This may enhance wind forcing on Arctic coasts. Lake sediments can record these changes through the deposition of wind‐blown grains and elements, offering ...
Zofia Stachowska   +5 more
wiley   +1 more source

Rotating dust particles in the coma of comet 67P/Churyumov-Gerasimenko [PDF]

open access: yes, 2015
Context. During September and October, 2014, OSIRIS cameras onboard ESA Rosetta mission detected millions of single particles. Many of these dust particles appear as long tracks (due to both the dust proper motion and the spacecraft motion during the ...
Lamy, P.   +226 more
core   +2 more sources

Modeling Ice and Dust in Comet C/2017 K2 (Pan-STARRS)’s Coma

open access: yesThe Planetary Science Journal
C/2017 K2 (Pan-STARRS) is a long-period comet that has been active since 24 au inbound and likely as far out as 35 au, far beyond where the sublimation of water ice can power cometary activity.
Megan Firgard, Theodore Kareta
doaj   +1 more source

Spatial and Temporal Vegetation and Peat Depth Patterns in Alpine, Subalpine and Montane Peatlands of South‐Eastern Australia

open access: yesEcological Management &Restoration, Volume 28, Issue 1, January 2027.
ABSTRACT Alpine, subalpine and montane peatlands provide important ecosystem services, including carbon storage, water regulation and habitat provision, and are threatened by a range of disturbance and degradation processes that impact these services.
Caitlyn Parsons   +5 more
wiley   +1 more source

The Evolution in Coma Molecular Composition of Comet C/2017 K2 (PanSTARRS) across the H2O Sublimation Zone: ALMA Imaging of a H2O-dominated Coma

open access: yesThe Planetary Science Journal
We report a survey of molecular emission from cometary volatiles using the Atacama Large Millimeter/submillimeter Array toward comet C/2017 K2 (PanSTARRS) carried out on UT 2022 September 21, 22, and 23 at a heliocentric distance ( r _H ) of 2.1 au ...
Nathan X. Roth   +10 more
doaj   +1 more source

Post-perihelion dust activity and a candidate icy-grain halo in long-period comet C/2023 A3 (Tsuchinshan–ATLAS)

open access: yesAstronomy & Astrophysics
We analyze the post-perihelion coma of the Great Comet of 2024, C/2023 A3 (Tsuchinshan–ATLAS), to characterize its dust activity and assess the contribution of sublimating icy grains to a candidate near-nucleus halo.
Liu Bin   +3 more
doaj   +1 more source

A Comprehensive Model of Morphologically Realistic Cosmic Dust Particles: An Application to Mimic the Unusual Polarization Properties of the Interstellar Comet 2I/Borisov

open access: yesThe Astrophysical Journal, 2023
The cosmic dust particles found in space are mainly porous aggregates of smaller grains. Theoretically, these aggregates are replicated using fractal geometry, assuming a cluster of spheres.
Prithish Halder, Sujan Sengupta
doaj   +1 more source

Endotoxins and Biological Implications—Review

open access: yesPublic Health Challenges, Volume 5, Issue 4, December 2026.
Graphical overview of endotoxin sources, exposure routes, biological effects, detection methods, and routes of elimination. ABSTRACT Endotoxins, also known as lipopolysaccharides (LPSs), are structural components of the outer membrane of Gram‐negative bacteria and some cyanobacteria.
Uzair Ishtiaq   +5 more
wiley   +1 more source

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