Results 1 to 10 of about 252,598 (208)

A Solar Analog Model for Decrease in Far Ultraviolet Irradiance Under a Grand Minimum

Earth and Space Science, Volume 13, Issue 9, September 2026.
Abstract Solar analog field stars having a range of magnetic activity can provide an estimate of solar spectral irradiance (SSI) variability relevant to understanding the Sun's influence on terrestrial climate. This approach is particularly useful for far ultraviolet (FUV) irradiance that cannot be observed from the Earth surface.
D. Lubin, C. Melis, D. Tytler
wiley   +1 more source

Identifying and Distinguishing Quenching Galaxies with Spatially Resolved Star Formation in TNG50

The Astrophysical Journal
Using the TNG50 simulation, we determine observationally motivated metrics that can distinguish quenching galaxies from star-forming galaxies for M _* ≥ 10 ^9.5 M _⊙ , based on the spatial distribution of their stellar populations. Quenching galaxies are
Cameron Lawlor-Forsyth, Michael L. Balogh, Elizaveta Sazonova, Cameron R. Morgan, Sean L. McGee, Gregory H. Rudnick   +5 more
doaj   +1 more source

The Great Cosmic Silence: What Does the Fermi Paradox Tell About the Future of Humanity?

Global Policy, Volume 17, Issue 4, Page 553-565, September 2026.
ABSTRACT This article examines how institutional time horizons shape the long‐term survival prospects of human technological civilisation. While research on global catastrophic and existential risks has expanded, the temporal structures of political‐economic institutions remain underexamined.
Heikki Patomäki
wiley   +1 more source

The SAGA Survey. IV. The Star Formation Properties of 101 Satellite Systems around Milky Way–mass Galaxies

The Astrophysical Journal
We present the star-forming properties of 378 satellite galaxies around 101 Milky Way analogs in the Satellites Around Galactic Analogs (SAGA) Survey, focusing on the environmental processes that suppress or quench star formation.
Marla Geha, Yao-Yuan Mao, Risa H. Wechsler, Yasmeen Asali, Erin Kado-Fong, Nitya Kallivayalil, Ethan O. Nadler, Erik J. Tollerud, Benjamin Weiner, Mithi A. C. de los Reyes, Yunchong Wang, John F. Wu   +11 more
doaj   +1 more source

The Role of the Southeastern European Mountains as Cradles and Corridors of European Biodiversity: Insights From Agelenid Spiders

Journal of Biogeography, Volume 53, Issue 9, September 2026.
ABSTRACT Aim The Southeastern European Mountain System (SEEMS) is a well‐known glacial refugium for European fauna. Bridging the Mediterranean and Caucasus biodiversity hotspots, it is a melting point for diverse faunal elements, but also a center of origin and subsequent dispersal of a unique component of European biodiversity.
Dragomir Dimitrov, Simeon Indzhov, Desislava Stoianova, Dimitar Dimitrov, Miquel A. Arnedo   +4 more
wiley   +1 more source

Active Galactic Nucleus Feedback in an Elliptical Galaxy. IV. The Importance of the Jet–Wind Coupling

The Astrophysical Journal
This is the fourth paper of our series investigating the effects of active galactic nucleus (AGN) feedback in the evolution of an elliptical galaxy using the MACER framework.
Minhang Guo, Feng Yuan, Suoqing Ji, Bocheng Zhu   +3 more
doaj   +1 more source

The SVP–FRO6 Module Integrates the Control of Leaf Senescence and Flowering in Arabidopsis

Plant, Cell &Environment, Volume 49, Issue 9, Page 7191-7209, September 2026.
ABSTRACT Plants coordinate major developmental transitions by integrating intrinsic genetic programs with environmental signals, where nutrient availability serves as a critical external factor shaping growth and fitness. Iron (Fe), an essential micronutrient for cellular respiration and photosynthesis, is strictly regulated through sophisticated ...
Hyunsu Park, Yeong Seon Yoon, Sanghoon Park, Ukcheol Jeong, Hyeyoung Choi, Hyunwoo Oh, Dovran Shamamedov, Zhonghai Li, Hye Ryun Woo   +8 more
wiley   +1 more source

Revealing the Impact of Critical Stellar Central Density on Galaxy Quenching through Cosmic Time

The Astrophysical Journal
In a previous work, we investigated the structural and environmental dependence on quenching in the nearby universe. In this work, we extend our investigations to higher redshifts by combining galaxies from the Sloan Digital Sky Survey and The FourStar ...
Bingxiao Xu, Yingjie Peng
doaj   +1 more source

When Communication Enables Catastrophe: Nuclear Risk and the Short Lifetimes of Technological Civilizations

Risk Analysis, Volume 46, Issue 9, September 2026.
ABSTRACT The Fermi paradox may partly reflect technological self‐destruction acting as a Great Filter during post‐industrial development. Because the empirical record consists of a single civilization observed over an eighty‐year nuclear age, the exercise reported here is best understood as a structured, historically anchored scenario analysis rather ...
Vincenzo Alfano
wiley   +1 more source

Inside-out versus Outside-in Quenching of MaNGA Galaxies: Dependence on Stellar Mass and Environment

The Astrophysical Journal
Galaxy quenching, the cessation of star formation, can proceed in spatially distinct ways, commonly described as inside-out or outside-in. However, the inferred quenching pattern depends strongly on how quenched or quenching regions are defined ...
Zi-Hua Ho, Lihwai Lin, Hung-Yu Jian, Bau-Ching Hsieh, Carlos López-Cobá, S. F. Sánchez, Wen-Yen Wu, Shuai Feng, Shiyin Shen   +8 more
doaj   +1 more source