Ventricle
发表于 2025-3-23 12:47:46
A Review of Recent Observations of Dust in H , Regionsust be high for λ > 504 Å. This restriction is lifted if the visual extinction cross section of the grains in H . regions is less than that for grains in the general interstellar medium. New observations of the Orion Nebula indicate that the visual extinction cross section is within a factor 2 of the value in the general interstellar medium.
consolidate
发表于 2025-3-23 14:42:32
The Influence of Grain Mantles on the Formation of Hydrogen Molecules on Grain Surfacesm these measurements temperature ranges in which H atoms might combine on the surface to form H. molecules are estimated..Duley has discussed the formation and composition of condensed gas mantles on interstellar grains. The effects of such mantles in promoting and poisoning hydrogen molecule formation are discussed.
defuse
发表于 2025-3-23 19:59:50
Existence and Amount of Intergalactic Dust the centers of clusters of galaxies) and 2 × 10. g cm. (in general intergalactic space), The grains may be formed either in the early phases of the Universe (25 < . < 50) or may be expelled from galaxies by the radiation pressure. The most effective destruction process seems to be the evaporation by soft cosmic rays.
Hyperopia
发表于 2025-3-23 22:50:44
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不自然
发表于 2025-3-24 04:32:30
Considerations About the Absorption Efficiency of Dust Particles in the Infraredimations fails for the graphite particle while it is variable for the silicate dust grain. The ice core mantle particles can instead be treated with approximated formulae without introducing appreciable errors.
我正派
发表于 2025-3-24 07:10:46
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BRAVE
发表于 2025-3-24 13:47:55
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禁令
发表于 2025-3-24 15:32:05
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哑剧
发表于 2025-3-24 22:45:39
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antenna
发表于 2025-3-25 01:58:41
Diffuse Interstellar Band Formation in Dense Cloudsn in dense interstellar clouds. Data on 10 stars in the . Ophiuchi cloud complex show further that the diffuse band-producing efficiency of the grains decreases systematically with increasing grain size. It is concluded that the diffuse bands are not formed in the mantles which accrete on the grains