Results 31 to 40 of about 4,398 (186)

STELLA—Potential European contributions to a NASA-led interstellar probe

Frontiers in Astronomy and Space Sciences, 2022
The discovery of a myriad of exoplanets in the past decades has revolutionized the understanding of our place in the Universe. How different are exoplants and do some of them harbor life, just like Earth? To do so, their parent stars must drive a stellar
Robert F. Wimmer-Schweingruber, Nicolas André, Stanislav Barabash, Pontus C. Brandt, Timothy S. Horbury, Luciano Iess, Benoit Lavraud, Ralph L. McNutt, Elena A. Provornikova, Eric Quémerais, Robert Wicks, Martin Wieser, Peter Wurz   +12 more
doaj   +1 more source

On carbon nanotubes in the interstellar medium [PDF]

Monthly Notices of the Royal Astronomical Society, 2020
ABSTRACT Since their discovery in 1991, carbon nanotubes (CNTs) – a novel one-dimensional carbon allotrope – have attracted considerable interest worldwide because of their potential technological applications such as electric and optical devices.
Li, Qi, Li, Aigen, Jiang, B. W., Chen, Tao   +3 more
openaire   +2 more sources

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

Size Matters: Barrier Heights and Widths in the Kinetics Of Tautomerisation and Rotamerisation of Thiotropolone and Its Five‐ and Three‐Membered Cyclic Analogues

International Journal of Chemical Kinetics, EarlyView.
ABSTRACT Recent experiments by Nunes et al. have demonstrated that unprecedented control of chemical reactions is possible by narrowband infrared vibrational photo‐excitation at low temperatures in inert matrices. The generated higher energy level conformers may then undergo rotamerisation and tautomerisation reactions which provide extremely useful ...
Judith Wurmel, John M. Simmie
wiley   +1 more source

The interstellar medium

This is a pre-print of a chapter for the Encyclopedia of Astrophysics (edited by I. Mandel, section editor S.
  +5 more sources

First Photometric, Orbital Period, and Tidal Instability Investigations for Four Contact Binaries with Extremely Low Mass Ratios

The Astronomical Journal
Contact binaries with extremely low mass ratios, known as the most plausible progenitors of luminous red novae, are critical targets for refining theoretical models of binary mergers and investigating the lower mass ratio limit of contact binaries.
Yun-Xia Yu, Xue-Tong Liu, Zi-Bin Meng, Ke Hu, Zhen-Xin Lei, Fu-Yuan Xiang   +5 more
doaj   +1 more source

Cis–Trans Rotational Isomerism of Formic Acid, Sulfur, and Selenium Analogues and Their Dimers: Chemical Kinetics Under Interstellar Conditions

International Journal of Chemical Kinetics, EarlyView.
ABSTRACT We present chemical kinetic rate constants for the cis to trans isomerisation or rotamerization of monomeric seleno‐, thio‐, and formic acids and that of three of their dimeric species, based on variational transition state theory and multidimensional tunneling calculations in the gas‐phase, from 10 K to 300 K. These provide, firstly, reliable
Judith Wurmel, John M. Simmie
wiley   +1 more source

Enantioselective Synthesis of a New Class of Stable and Functionalized Cyclopentadienes via CuH‐Catalysis

Angewandte Chemie, Volume 138, Issue 32, 3 August 2026.
Cyclopentadienes (CpHs) are fundamental building blocks with widespread applications in chemistry. However, their inherent acidity and isomeric instability have long limited access to chiral variants in an asymmetric fashion. Here, we introduce a CuH‐catalyzed asymmetric transformation that provides an unprecedented entry into a new class of ...
Piero Soppelsa, Riccardo Bellin, Besma Boulila, Francesco Vaghi, Manuel Orlandi   +4 more
wiley   +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

Interstellar Pathfinder — A Mission to the Inner Edge of the Interstellar Medium [PDF]

AIP Conference Proceedings, 2003
Interstellar Pathfinder (ISP), our first step into the interstellar medium, is a scientific investigation to study the outer boundary of our heliosphere and the interstellar matter that flows into it. A wind of interstellar neutral gas penetrates to within several astronomical units (AU) of the Sun, giving us a direct sample of present‐day galactic ...
McComas, D. J., Bochsler, P. A., Fisk, Lennard A., Funsten, H. O., Geiss, Johannes, Gloeckler, George, Gruntman, Mike, Judge, D. L., Krimigis, S. M., Lin, Robert P., Livi, S., Mitchell, D. G., Möbius, Eberhard, Roelof, Edmond C., Schwadron, Nathan A., Witte, M., Woch, J., Wurz, Peter, Zurbuchen, Thomas H.   +18 more
openaire   +4 more sources