Computer Science
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982sciam.246...84b&link_type=abstract
Scientific American, vol. 246, Apr. 1982, p. 84-90, 92, 94.
Computer Science
8
Galactic Structure, Molecular Clouds, Carbon Monoxide, Globular Clusters, Hydrogen Clouds, Molecular Rotation, Stellar Evolution
Scientific paper
The composition and mechanisms in giant interstellar clouds composed mainly of hydrogen molecules are discussed, noting that cloudy regions in galactic spiral arms are the birthplace of many stars forming in the Galaxy. The average density of interstellar gas is less than one atom/cu m, whereas gaseous regions are 10-50% molecular, and are usually imbedded in envelopes of atomic gas. Identification of the components of the clouds, which have been found to be 99% molecular hydrogen, has rested on determining the spectral lines emitted by collisions which cause transitions between rotational states. Examples of the 53 identified molecules are given, notably CH3CH2OH (known as ethyl alcohol). Using CO as a target source for the examination of clouds has permitted radio observations from urban areas and 20 giant clouds have been found for each galactic globular cluster. Finally, the formation of the clouds, the formation of stars within the clouds, and the effects of stars on the clouds are considered.
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