Results 91 to 100 of about 2,376 (273)

Small but mighty: Impact hazards from iron Near‐Earth Objects

Meteoritics &Planetary Science, EarlyView.
Abstract Small asteroids can impact Earth unexpectedly, as demonstrated by the Chelyabinsk event in 2013. The warning times are likely to be short, and the first tools for fast hazard predictions have been developed in the last years for encounters with rocky or cometary objects, which quickly fragment in the atmosphere and cause airbursts. However, in
Robert Luther, Natalia Artemieva, Andrea Schmalen, Kai Wünnemann, Detlef Koschny, Richard Moissl   +5 more
wiley   +1 more source

A geophysical investigation of the Roter Kamm impact crater, Namibia

Meteoritics &Planetary Science, EarlyView.
Abstract The Roter Kamm impact crater is located in the southern Namib Desert. The crater has a diameter of 2.5 km and belongs to the category of simple, bowl‐shaped impact craters, with an elevated rim of fractured target rock. The crater's interior is completely buried beneath sediments, preventing extensive surface investigations of the bedrock ...
Hannah Nienhaus, Pritam Yogeshwar, Wiebke Mörbe, Bülent Tezkan, Yajun Liu, Bufelo Lushetile, Martin Melles   +6 more
wiley   +1 more source

DESIVAST: Catalogs of Low-redshift Voids Using Data from the DESI Data Release 1 Bright Galaxy Survey

The Astrophysical Journal
We present three separate void catalogs created using a volume-limited sample of the DESI Data Release 1 Bright Galaxy Survey. We use the algorithms VoidFinder and V ^2 to construct void catalogs out to a redshift of z = 0.24. Excluding voids affected by
Hernan Rincon, Segev Benzvi, Kelly Douglass, Dahlia Veyrat, Jessica Nicole Aguilar, Steven Ahlen, Davide Bianchi, David Brooks, Todd Claybaugh, Shaun Cole, Axel de la Macorra, Peter Doel, Andreu Font-Ribera, Jaime E. Forero-Romero, Enrique Gaztañaga, Satya Gontcho A Gontcho, Gaston Gutierrez, Klaus Honscheid, Cullan Howlett, Stephanie Juneau, Robert Kehoe, Sergey Koposov, Andrew Lambert, Martin Landriau, Laurent Le Guillou, Aaron Meisner, Ramon Miquel, John Moustakas, Gustavo Niz, Will Percival, Francisco Prada, Ignasi Pérez-Ràfols, Graziano Rossi, Eusebio Sanchez, Michael Schubnell, Hee-Jong Seo, David Sprayberry, Gregory Tarlé, Benjamin Alan Weaver, Hu Zou   +39 more
doaj   +1 more source

f(R, Σ, T) gravity and cosmic acceleration: A comprehensive analysis of physical and kinematical parameters

Nuclear Physics B
This study investigates the cosmological implications of the modified gravity model f(R, Σ, T), which extends general relativity by incorporating additional geometric and matter-energy contributions.
S.H. Shekh, Anil Kumar Yadav, Anirudh Pradhan, Nafis Ahmad   +3 more
doaj   +1 more source

Rapid terrestrial weathering of the CI1 carbonaceous chondrite find Oued Chebeika 002

Meteoritics &Planetary Science, EarlyView.
Abstract Alteration of historic CI1 meteorite falls during their curation demonstrates the susceptibility of smectite‐rich carbonaceous chondrites to terrestrial exposure. The discovery of Oued Chebeika 002 in Morocco in June 2024 presents a unique opportunity to document the earliest stages of weathering of a CI1 find.
Martin R. Lee, Jasper Glazer
wiley   +1 more source

A Hydrodynamical Simulations-based Model that Connects the FRB DM–Redshift Relation to Suppression of the Matter Power Spectrum via Feedback

The Astrophysical Journal
Understanding the impact of baryonic feedback on the small-scale ( k  ≳ 1 h Mpc ^−1 ) matter power spectrum is a key astrophysical challenge, and essential for interpreting data from upcoming weak-lensing surveys, which require percent-level accuracy to ...
Kritti Sharma, Elisabeth Krause, Vikram Ravi, Robert Reischke, Pranjal R. S., Liam Connor   +5 more
doaj   +1 more source

Observational issues in loop quantum cosmology [PDF]

, 2014
A Barrau, T Cailleteau, J Grain, J Mielczarek   +3 more
openalex   +1 more source

Sampling the volcanic plumes at Io: Impact speeds and shock conditions

Meteoritics &Planetary Science, EarlyView.
Abstract The desire to sample material from the interior of Io, by flying through its volcanic plumes, requires consideration of the flyby speed and the types of sample collection techniques that can be utilized. Low speed collection (1–2.5 km s−1) would require an orbit around Io itself, which is unlikely due to the accumulated radiation dose that ...
M. J. Burchell, R. C. Ogliore, P. J. Wozniakiewicz   +2 more
wiley   +1 more source

Age of Massive Galaxies at Redshift 8

The Astrophysical Journal
Recent James Webb Space Telescope data analyses have shown that massive red galaxies existed at redshifts z ≳ 6, a discovery that is difficult to understand in the context of standard cosmology (ΛCDM).
M. López-Corredoira, F. Melia, J.-J. Wei, C.-Y. Gao   +3 more
doaj   +1 more source

"Doppler De-boosting" and the Observation of "Standard Candles" in Cosmology

, 2021
Mark V. Zilberman
openalex   +1 more source