Results 81 to 90 of about 10,200 (231)
The Constraint of Crewed Mars Missions Based on Current Radiation Dose Measurements
Space Weather, Volume 24, Issue 3, March 2026.Abstract Crewed missions to Mars will be a milestone of future space exploration programs. However, the absence of Earth's magnetic field leaves astronauts directly exposed to unattenuated energetic particles in deep space, primarily galactic cosmic rays (GCRs), resulting in significantly higher radiation levels and enhanced health risks. Understanding
Chao Zhang +4 more
wiley +1 more source
Molecular hydrogen in galaxies [PDF]
, 1987 This study aims to understand the key role played by molecular hydrogen in the evolution of galaxies, with a view to constraining its radial distribution in the Galaxy and the CO→H(_2) conversion factor α(_20).The star formation rate is shown to be ...
Wilkinson, David Adam, Wilkinson, D.A
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The Astrophysical JournalWe present a detailed study of radio-detected dwarf galaxies ( M _⋆ ≲ 3 × 10 ^9 M _⊙ ) to characterize extreme star formation and search for (variable) radio active galactic nuclei (AGNs). Our sample comes from A. E.
John-Michael Eberhard, Amy E. Reines
doaj +1 more source
Shock metamorphic effects in Itokawa phosphates: A comparison with megaregolith‐derived meteorites
Meteoritics &Planetary Science, Volume 61, Issue 3, Page 351-370, March 2026.Abstract Returned regolith samples from the asteroid Itokawa provide a unique opportunity to compare shock metamorphic effects in unconsolidated regolith materials with those preserved in lithified meteorites, that is, megaregolith. We analyzed four Itokawa particles (Ueda—RA‐QD02‐0519, Narahara—RA‐QD02‐0573, Domon—RA‐QD02‐0588, Ishiuchi—RX‐MD03‐0212 ...
E. Dobrică, A. N. Krot, A. J. Brearley
wiley +1 more source
Search for blue compact dwarf galaxies during quiescence [PDF]
, 2008 Blue compact dwarf (BCD) galaxies are metal-poor systems going through a major starburst that cannot last for long. We have identified galaxies which may be BCDs during quiescence (QBCD), i.e., before the characteristic starburst sets in or when it has ...
GUILLERMO TENORIO TAGLE
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Searches for ultracompact dwarf galaxies in galaxy groups [PDF]
Monthly Notices of the Royal Astronomical Society, 2007 8 pages, 2 figures, accepted for publication in ...
Evstigneeva, E. A. +6 more
openaire +4 more sources
Physiologia Plantarum, Volume 178, Issue 2, March/April 2026.ABSTRACT Chloroplast movements are an important photoprotective mechanism in land plants. The magnitude of chloroplast responses depends on light conditions. We investigated variation in chloroplast movements and leaf physiological traits in three species: a deciduous dwarf shrub, Vaccinium myrtillus, and two wintergreen herbaceous perennials, Homogyne
Paweł Hermanowicz +3 more
wiley +1 more source
Star Formation History of Dwarf Galaxies in Cosmological Hydrodynamic Simulations
Advances in Astronomy, 2010 We examine the past and current work on the star formation (SF) histories of dwarf galaxies in cosmological hydrodynamic simulations. The results obtained from different numerical methods are still somewhat mixed, but the differences are understandable ...
Kentaro Nagamine
doaj +1 more source
Astronomische Nachrichten, Volume 347, Issue 1, January 2026.ABSTRACT Isochrones, equal‐age curves, are widely used in astrophysics to estimate stellar ages. Classical stellar parameters are, however, very limited in their usability for main sequence stars because of their weak age‐dependence. Here, rotation period measurements provide complementary information.
David Gruner, Sydney A. Barnes
wiley +1 more source
Measuring the star formation rate density from CNOC2 [PDF]
, 2006 This thesis charts the evolution of the Universal Star Formation Rate Density (SFRD) across the redshift range 0.2 < z < 0.6, using the 2nd Canadian Network for Observational Cosmology Survey (CN0C2).
Whitaker, Richard James
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