Results 181 to 190 of about 7,455 (223)
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Scientific American, 1973
During the past three years, molecules have been discovered in interstellar clouds with an abundance and chemical complexity totally unexpected by astrophysicists. Twenty-three molecules in a total of 34 isotopic combinations have now been identified through radio spectral line observations at more than 75 wavelengths from 2 millimeters to 36 ...
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During the past three years, molecules have been discovered in interstellar clouds with an abundance and chemical complexity totally unexpected by astrophysicists. Twenty-three molecules in a total of 34 isotopic combinations have now been identified through radio spectral line observations at more than 75 wavelengths from 2 millimeters to 36 ...
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Interstellar molecules and the origin of life
Space Life Sciences, 1971Synopsis of the various views expressed at the conference held at NASA Ames Research Center in February 1971 on the relationship of interstellar molecules to the origin of life, intended to provide a basis for future discussion and work in this area. The topics covered include: a summary of molecules discovered, the interstellar environment, laboratory
D, Buhl, C, Ponnamperuma
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Interstellar Molecules and Dense Clouds
Science, 1971Current knowledge of the interstellar medium is discussed on the basis of recent published studies. The subjects considered include optical identification of interstellar molecules, radio molecular lines, interstellar clouds, isotopic abundances, formation and disappearance of interstellar molecules, and interstellar probing techniques.
D M, Rank, C H, Townes, W J, Welch
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Circumstellar and Interstellar Synthesis of Organic Molecules
Origins of life and evolution of the biosphere, 1997We review the formation and evolution of complex circumstellar and interstellar molecules. A number of promising chemical routes are discussed which may lead to the formation of polycyclic aromatic hydrocarbon molecules, fullerenes, and unsaturated hydrocarbon chains in the outflows from stars.
A G, Tielens, S B, Charnley
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Interstellar Molecules and Interstellar Chemistry
1986Radio astronomers have to date detected some 60 or so molecules in interstellar space. These molecules have been identified, in the majority of cases, by recording the microwave spectrum received by radio telescope from an interstellar or circumstellar dust cloud and comparing it with the spectra produced in laboratory experiments.
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Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1987
Abstract Some 70 different molecular species have so far been detected variously in diffuse interstellar clouds, dense interstellar clouds and circumstellar shells. Only simple (diatomic and triatomic) species exist in diffuse clouds because of the penetration of destructive ultraviolet radiations, whereas more complex (polyatomic ...
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Abstract Some 70 different molecular species have so far been detected variously in diffuse interstellar clouds, dense interstellar clouds and circumstellar shells. Only simple (diatomic and triatomic) species exist in diffuse clouds because of the penetration of destructive ultraviolet radiations, whereas more complex (polyatomic ...
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Astrophysics and Space Science, 1977
We propose that photocycloaddition reactions in molecular complexes in normal interstellar clouds will create unusually large molecules. These may be sufficiently radiation stable to be circulated with the interstellar gas, and so provide convenient nucleation centres for growth of loosely bound grains in dark regions.
T. J. Millar, D. A. Williams
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We propose that photocycloaddition reactions in molecular complexes in normal interstellar clouds will create unusually large molecules. These may be sufficiently radiation stable to be circulated with the interstellar gas, and so provide convenient nucleation centres for growth of loosely bound grains in dark regions.
T. J. Millar, D. A. Williams
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A new interstellar molecule: triearbon monoxide
Nature, 1984The published version is located at http://www.nature.com/nature/journal/v310/n5973/abs/310125a0 ...
MATTHEWS, HE +4 more
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Molecules in Interstellar Clouds
1981The physical and chemical state of interstellar clouds is reviewed, including recent investigations at the Onsala Space Observatory. The Orion A region is chosen as an example of a “giant” molecular cloud and hence a formation site for massive stars. The Taurus Molecular Clouds, in contrast, may be the future birthplace of solar-type stars.
Irvine, William M. +2 more
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