Results 131 to 140 of about 8,101 (167)

Interstellar Dust Clouds

Nature, 1971
THE failure, thus far, to detect gaseous emission lines from circumstellar dust clouds1–3 and from Bok globules2 raises the possibility that such clouds consist solely of dust grains. The possibility has previously been largely discounted on the grounds that relative diffusion of the grains and gas is slow and inefficient requiring time scales which ...
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Physics of Interplanetary and Interstellar Dust

Space Science Reviews, 1996
Observations of dust in the solar system and in the diffuse interstellar medium are summarized. New measurements of interstellar dust in the heliosphere extend our knowledge about micron-sized and bigger particles in the local interstellar medium. Interplanetary grains extend from submicron- to meter-sized meteoroids. The main destructive effect in the
Eberhard Gr�n, Jiri Svestka
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Interstellar dust in the solar system

Earth, Moon, and Planets, 2004
Dust is an important component of galactic stucture and the cyclic processing of particulate matter leads to stellar and planetary formation. Though astronomical methods using analysis of dust-penetrating starlight can provide some limited information about the dust, the prospect of its in-situ sampling within the Solar System by spacecraft and its ...
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From Interstellar Dust to Comets to Comet Dust: A Test of the Interstellar Dust Model of Comets

1991
The interstellar dust model of comets is used as a basis to simultaneously satisfy various observational constraints and to derive the porosity of comet dust. The observational constraints are: (1) the strengths of the 3.4 µm and 9.7 µm emission bands; (2) the shape of the 9.7 µm band; (3) the relative amount of silicates to organic materials; (4) the ...
J. M. Greenberg, J. I. Hage
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Evolution of Interstellar Dust

1987
This paper presents a review of our current knowledge of interstellar dust. The composition of the interstellar dust is summarized in Table 1. About half of the dust volume consists of amorphous silicates. The other half has to be made up out of a carbonaceous component, such as graphite, amorphous carbon (e.g., soot), and/or organic grain mantles (e.g.
A. G. G. M. Tielens, L. J. Allamandola
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Dust as interstellar catalyst

2016
International ...
Cazaux, S., Minissale, M., Dulieu, F., Hocuk, S.   +3 more
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The Diffuse Interstellar Bands and Interstellar Dust

1995
As far as we now know, interstellar dust and the diffuse interstellar bands (DIBs) are not directly related; there is no really good correlation between any DIB and a specific feature of interstellar extinction. I argue that it is not useful to consider the λ2175 “bump”, by far the strongest feature in the interstellar extinction law (in terms of ...
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Interstellar Dust

Annual Review of Astronomy and Astrophysics, 1968
Beverly T. Lynds, N. C. Wickramasinghe
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Interstellar Dust and Circumstellar Dust Disks

2001
Interstellar dust research belongs to the young branches of astrophysics. With the establishment of sensitive observational techniques in the astronomical infrared spectroscopy in the 1960s, diagnostic circumstellar and interstellar dust bands were detected and induced an explosive development of the whole field.
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On the alignment of interstellar dust

Physica, 1969
Abstract Two alignment mechanisms have been investigated by means of a Monte Carlo model. In the mechanism suggested by Gold, needles or flakes which have a sufficiently high velocity with respect to the gas around them are aligned in consequence of the anisotropy of the angular momentum acquired by a grain in collision with gas atoms.
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