Results 31 to 40 of about 62,910 (265)
Fragmentation in molecular clouds [PDF]
Symposium - International Astronomical Union, 1991 B209. Fragments are detected in the outer parts of the B209 molecular cloud in a region of density 1000 cm−3 using 12CO, 13CO, H2CO, IRAS 60 and 100 μm images, discernable as velocity components, and have characteristics: <Rfragment>∼ 0.4 pc; <Mfragment>∼ 2 M⊙; <MVRfragment>∼ 1.6 M⊙ km/s pc; Tgas ∼ 11 K; Tdust> ∼ 16 K??. The system
Frank O. Clark +2 more
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An Investigation of the Entropy Associated with a Collapsing Molecular Cloud
AstronomyThe investigation of entropy variation during the star formation process within collapsing molecular clouds represents a significant field of inquiry in astrophysics.
Gemechu Muleta Kumssa
doaj +1 more source
Molecular composition and processing of aqueous secondary organic aerosol in clouds at a mountain site in southeastern China [PDF]
Atmospheric Chemistry and PhysicsAqueous secondary organic aerosol (aqSOA) contributes substantially to organic aerosol (OA), affecting air quality, human health, and climate. However, the molecular composition and processing of aqSOA in clouds remain unclear due to limited online field
Y. Jin +20 more
doaj +1 more source
Possibilities for Methanogenic and Acetogenic Life in Molecular Clouds
LifeAccording to panspermia, life on Earth may have originated from life forms transported through space from elsewhere. These life forms could have passed through molecular clouds, where the process of methanogenesis could have provided enough energy to ...
Lei Feng
doaj +1 more source
Chemistry of Molecular Clouds [PDF]
International Astronomical Union Colloquium, 1989 AbstractA discussion is presented of the chemistry of quiescent molecular clouds, and the effects of the presence of polycyclic aromatic hydrocarbon molecules and of cosmic-ray induced ultraviolet photons are examined. A comparison is made with the chemistry occurring in molecular clouds that are subjected to shocks and the differences between ...
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The Astrophysical Journal, 1984 CO observations of the peculiar galaxy M82 have been made at 79 positions using the 14 m FCRAO telescope (HPBW = 50'') in order to obtain a fully sampled map of the central 2 kpc as well as the radial distribution of molecular gas out to 3 kpc along the major axis.
Young, JS, SCOVILLE, NZ
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Molecular Clouds: Comet Factories? [PDF]
International Astronomical Union Colloquium, 1985 AbstractRecent discoveries seem to indicate a catastrophic history of terrestrial evolution, explicable in terms of Oort cloud disturbance by molecular clouds in the Galactic disc. The problem of Oort cloud replenishment thus assumes considerable significance and reasons are given for supposing comet exchange takes place during actual penetration of ...
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High altitude molecular clouds [PDF]
The Astrophysical Journal, 1994 A population of molecular clouds with a significantly greater scale height than that of Giant Molecular Clouds has been identified by examining maps of the latitude distribution of the $^{12}CO(1-0)$ emission in the first quadrant of the Galaxy. These clouds are found by identifying emission more than 2.6 times the scale-height away from the galactic ...
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Primordial molecular clouds [PDF]
Conference on 3K cosmology, 1999 12 pages, 1 figures, Invited Talk at 3K Cosmology Conference-Roma October ...
Puy, D., Signore, M.
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Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM
FEBS Letters, EarlyView.Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley +1 more source