Results 1 to 10 of about 581,809 (219)

Missing interstellar sulfur in inventories of polysulfanes and molecular octasulfur crowns [PDF]

Nature Communications
The disparity between predicted sulfur abundances and identified reservoirs of sulfur in cold molecular clouds, also known as the sulfur depletion problem, has remained an ongoing debate over decades.
Ashanie Herath, Mason McAnally, Andrew M. Turner, Jia Wang, Joshua H. Marks, Ryan C. Fortenberry, Jorge C. Garcia-Alvarez, Samer Gozem, Ralf I. Kaiser   +8 more
doaj   +2 more sources

Deciphering the “Missing Xenon Paradox” in Celestial Bodies: A Multifaceted Perspective Toward Demystifying This Enigma

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract Xenon (Xe) is a heavy noble gas with intriguing chemical properties, such as having several stable isotopes and the ability to form compounds under extreme conditions. Despite the predictions based on cosmochemical models that suggest xenon should be relatively abundant in planetary reservoirs, empirical data indicate a significant depletion ...
Avinash Kumar Both, Avradip Ghosh, Chin Li Cheung   +2 more
wiley   +1 more source

Nearby Supernova and Cloud Crossing Effects on the Orbits of Small Bodies in the Solar System

The Astrophysical Journal Letters
Supernova (SN) blasts envelop many surrounding stellar systems, transferring kinetic energy to small bodies in the systems. Geologic evidence from ^60 Fe points to recent nearby SN activity within the past several Myr.
Leeanne Smith, Jesse A. Miller, Brian D. Fields   +2 more
doaj   +1 more source

Detection of the Polycyclic Aromatic Hydrocarbon Phenalene (C13H10) in the Very Low-luminosity Object MC27/L1521F

The Astrophysical Journal Letters
To date, 14 polycyclic aromatic hydrocarbons (PAHs) ranging in size from two to seven (including five- and six-membered) carbon rings have been detected in the starless dense core Taurus molecular cloud (TMC-1 CP).
Gabi Wenzel, Thomas H. Speak, Ci Xue, Edwin A. Bergin, Andrew M. Burkhardt, Martin A. Cordiner, Miya Duffy, Zachary T. P. Fried, Andrew Lipnicky, Christopher N. Shingledecker, Reace H. J. Willis, Anthony J. Remijan, Michael C. McCarthy, Brett A. McGuire, Ilsa R. Cooke   +14 more
doaj   +1 more source

Overlapping Open Clusters NGC 1750 and NGC 1758 behind the Taurus Dark Clouds. II. CCD Photometry in the Vilnius System

Open Astronomy, 2003
Seven-color photometry in the Vilnius system has been obtained for 420 stars down to V = 16 mag in the area containing the overlapping open clusters NGC 1750 and NGC 1758 in Taurus.
Straižys V., Kazlauskas A., Černiauskas A., Boyle R. P., Vrba F. J., Philip A. G. Davis, Laugalys V., Černis K., Smriglio F.   +8 more
doaj   +1 more source

On the Genetic Relation Between Interstellar Clouds and Dust Clouds [PDF]

Symposium - International Astronomical Union, 1973
We propose that many of the denser dust clouds represent transient stages between the initiation of gravitational collapse of ordinary interstellar clouds by passage through a spiral galactic shock and the appearance of a stellar association. The interstellar gas is not processed at too rapid a rate (1) because the time spent between galactic shocks is
openaire   +1 more source

The Chemistry of Cold, Dark Interstellar Clouds [PDF]

Symposium - International Astronomical Union, 1987
In recent years the nearby cold, dark clouds have been shown to possess a rich chemistry, with interesting differences with respect to warmer massive-star-forming regions and also among the cold clouds themselves. 39 molecular species are now known in these regions.
openaire   +2 more sources

Implications for the formation of Oort cloud-like structures and interstellar comets in dense environments

Astronomy & Astrophysics
Most stars form in dense stellar environments, where frequent close encounters can strongly perturb and reshape the early architecture of planetary systems.
Torres Santiago
doaj   +1 more source

A study of X-ray point sources in Heiles Clouds 1 and 2

Acta Polytechnica
Star formation takes place in the coldest parts of molecular clouds, beginning in the densest, collapsing regions of filaments. As pre-main sequence stars are luminous X-ray emitters, X-ray point sources can serve as effective tracers of YSOs.
Nóra Varga, András Péter Joó, Bendegúz Koncz   +2 more
doaj   +1 more source

The Effect of an Inert Solid Reservoir on Molecular Abundances in Dense Interstellar Clouds

Open Astronomy, 2012
The question, what is the role of freeze-out of chemical species in determining the molecular abundances in the interstellar gas is a matter of debate.
Kalvāns Juris, Shmeld Ivar
doaj   +1 more source