Results 41 to 50 of about 34,202 (211)

Chemical Kinetics of 2‐, 4‐, and 2,4‐Seleno‐Uracils at Low Temperatures: Tautomerizations and Rotamerizations on Inert Matrices

International Journal of Chemical Kinetics, EarlyView.
ABSTRACT In the interstellar medium, chemical reactions proceed under conditions vastly different to those on Earth; these include extremely low temperatures and densities and take place in the gas phase and on water–ice grains. Understanding the energetics and more importantly the kinetics of such reactions is of relevance to the consequences on how ...
Judith Wurmel, John M. Simmie
wiley   +1 more source

Forming a constant density medium close to long gamma-ray bursts [PDF]

, 2006
The progenitor stars of long Gamma-Ray Bursts (GRBs) are thought to be Wolf-Rayet stars, which generate a massive and energetic wind. Nevertheless, about 25 percent of all GRB afterglows light curves indicate a constant density medium close to the ...
A. Achterberg, A. J. van Marle, Amati, Bloom, Brighenti, Canto, Castor, Chen, Chen, Chevalier, Chevalier, Comer'on, Crowther, Eldridge, Freyer, G. Garcaía-Segura, Garc'ia-Segura, Garc'ia-Segura, Garc'ia-Segura, Ghirlanda, Gruendl, Hamann, Holland, Huthoff, Koesterke, Langer, N. Langer, Ostriker, Panaitescu, Panaitescu, Panaitescu, Piran, Piran, Piro, Price, Rauw, Schaller, Stevens, Stone, Stratta, Thompson, van der Sluys, van Marle, van Marle, van Marle, Vink, Weaver, Wilkin, Woosley, Yoon   +49 more
core   +2 more sources

From Flybys to Sample Return: A Review of Space Probes and Robotic Sampling Technologies for Small Bodies

Journal of Field Robotics, EarlyView.
ABSTRACT As a crucial puzzle piece of deep space exploration, exploring small bodies can provide significant scientific insights and valuable mineral resources. Unlike missions to the Moon and Mars, small‐body missions pose distinct technical challenges, including communication delays, weak gravity, and uncertain environments. This paper reviews a full
Xin Zhang, Hao Zhou, Dalin Zhou, Zhaojie Ju   +3 more
wiley   +1 more source

The Passage of the Solar System through the Edge of the Local Bubble

The Astrophysical Journal
The Sun moves through the interstellar medium (ISM) at a velocity of ∼19 pc Myr ^−1 , making the conditions outside the solar system vary with time over millions of years.
Merav Opher, Abraham Loeb, Catherine Zucker, Alyssa Goodman, Ralf Konietzka, Alexandra Z. Worden, Evan P. Economo, Jesse A. Miller, João Alves, Jonathan Grone, Marc Kornbleuth, J. E. G. Peek, Michael M. Foley   +12 more
doaj   +1 more source

Spaceborne and spaceborn: Physiological aspects of pregnancy and birth during interplanetary flight

Experimental Physiology, EarlyView.
Abstract Crewed interplanetary return missions that are on the planning horizon will take years, more than enough time for initiation and completion of a pregnancy. Pregnancy is viewed as a sequence of processes – fertilization, blastocyst formation, implantation, gastrulation, placentation, organogenesis, gross morphogenesis, birth and neonatal ...
Arun V. Holden
wiley   +1 more source

Hydrogen wall and heliosheath Lyman-alpha absorption toward nearby stars: possible constraints on the heliospheric interface plasma flow

, 2002
In this paper, we study heliospheric Ly-$\alpha$ absorption toward nearby stars in different lines of sight. We use the Baranov-Malama model of the solar wind interaction with a two-component (charged component and H atoms) interstellar medium ...
Baranov, Baranov, Baranov, Baranov, Baranov, Baranov, Bertaux, Bertin, Bertin, Blum, Costa, Dalaudier, Dring, Fahr, Fichtner, Gruntman, Hebrard, Izmodenov, Izmodenov, Izmodenov, Izmodenov, Lallement, Lallement, Linsky, Linsky, Lipatov, Malama, Müller, Müller, Parker, Patterson, Richardson, Thomas, Vlad Izmodenov, Wang, Weller, Williams, Witte, Wood, Wood, Wood, Wood, Wood, Zank   +43 more
core   +1 more source

Tautomerization Kinetics of Thiouracils at Low Temperatures Driven Solely by Quantum‐Mechanical Tunnelling: Predictions of Suitable Candidates for Future Experiments

International Journal of Chemical Kinetics, Volume 58, Issue 6, Page 269-277, June 2026.
ABSTRACT In the past two decades numerous experiments have been conducted on the kinetics of reactions occurring at low temperatures on inert matrices. In particular, unimolecular proton‐transfer photo‐reactions of compounds containing a carbon–sulfur double bond, or thione group C═S, can lead to the formation of higher energy isomers or tautomers with
Judith Wurmel, John M. Simmie
wiley   +1 more source

On the Detection of Low‐Frequency Planetary Radio Emission With an Orbiting Interferometer

Radio Science, Volume 61, Issue 6, June 2026.
Abstract The magnetized planets of the outer Solar System produce kilometric radio emissions at very low frequencies (<1 ${< } 1\,$MHz). They reveal the planetary magnetic dynamics and their interaction with the solar wind. Those radio emissions can also serve as a proxy for interplanetary space weather monitoring.
E. Rouillé, B. Cecconi, B. Segret, J. N. Girard, A. Loh   +4 more
wiley   +1 more source

Exploring the Complex Heliotail Boundary by an Extended Level Set Approach

The Astrophysical Journal Letters
There is an ongoing debate regarding the shape of the heliotail. Studies have shown that the heliotail may be “comet-like,” extending for thousands of au. Some previous works defined the heliopause using magnetohydrodynamic variables, which only serve as
C. Onubogu, M. Opher, M. Kornbleuth, G. Tóth, V. Florinski   +4 more
doaj   +1 more source

Voyager observations of the interaction of the heliosphere with the interstellar medium

Journal of Advanced Research, 2013
This paper provides a brief review and update on the Voyager observations of the interaction of the heliosphere with the interstellar medium. Voyager has found many surprises: (1) a new energetic particle component which is accelerated at the termination
John D. Richardson
doaj   +1 more source