By J. P. Wild (auth.), G. Contopoulos (eds.)
The yr 1973 marked the top height of IAU job during the past. along with the Gen eral meeting in Sydney, and the intense basic meeting in Poland, there have been held 11 IAU Symposia and one Colloquium. numerous IAU courses disguise this task. The complaints of the Symposia are released in separate Volumes, whereas the Transactions of the final meeting and of the intense common meeting comprise brief reviews of the fee conferences, the executive periods, and the hole ceremonies. the current quantity covers many of the clinical Highlights of the final As sembly and of the intense normal meeting. It comprises 5 Invited Dis classes given in Sydney and Poland, a few chosen papers, and the Joint Discussions on the basic meeting of Sydney. in fact, there have been many extra papers of certain curiosity provided in Sydney which could no longer be incorporated during this quantity. Their titles could be visible within the studies of a few of the Commissions. it truly is regrettable that the Invited Discourses of C. H. Townes (Interstellar Molecules) and F. J. Low (Infrared Astronomy) weren't submitted for book. additionally basically 5 papers or abstracts of the Joint dialogue at the 'Origins of the Moon and Satellites' were to be had. regardless of those minor shortcomings, i think that the current quantity is devoted to its identify: it provides a considerable a part of the Highlights of Astronomy in 1973.
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Extra info for Highlights of Astronomy: As Presented at the XVth General Assembly and the Extra Ordinary General Assembly of the I.A.U. 1973
I would like, however, to mention briefly some of the solutions that have so far been proposed. 1. Initial Conditions According to this proposal, the initial conditions governing the Big Bang simply had the necessary properties. While this may be the correct answer, no self-respecting cosmologist would adopt it while any alternative is conceivable. 2. The Mix-Master Universe This proposal has the paradoxical property of trying to explain the observed isotropy by assuming that initially the Universe was highly anisotropic (though possibly homogeneous).
In addition, there are solid particles of dust, about 10- 5 cm across, which must be composed of heavier elements, as hydrogen and helium cannot condense llllder interstellar conditions. In 1972, the Orbiting Astronomical Observatory-3, which employs an 80-cm telescope at wavelengths between 1000A and 3000A, was launched in the United States and put into operation. In the ensuing year, it has demonstrated that much of the interstellar medium is composed of hydrogen molecules. This result, based upon the observation of Lyman-band absorption in the spectrum of early-type stars, had been anticipated by a rocket observation of Hz by Carruthers in 1970.
Hence, one concludes that some late-type stars are losing material and that much of the associated heavy elements has condensed to form dust. Quantitatively, it appears that the rate at which dust is being ejected into space by this mechanism is adequate to account for the amount of interstellar dust which is observed. 3. Depletion of Gas-Phase Elements If it is really true that heavy elements which are injected into space by stars have condensed partly into dust grains, one would expect this effect to show up when atoms and ions are sought spectroscopically in the gas phase.
Highlights of Astronomy: As Presented at the XVth General Assembly and the Extra Ordinary General Assembly of the I.A.U. 1973 by J. P. Wild (auth.), G. Contopoulos (eds.)