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  • 1995-1999  (4)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    How far the stars? (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 400 (1999), S. 34-35 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] From Earth and Moon to Sun and stars and on to galaxies and the Universe, our view of the world has grown more or less monotonically throughout recorded history, (at least Western history). It is this expanding horizon that Kitty Ferguson has set out to map. Her chosen method is to focus on ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/21821
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    ORIGIN OF THE BIOLOGICALLY IMPORTANT ELEMENTS (1997)
    Springer
    Origins of life and evolution of the biospheres 27 (1997), S. 3-21 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract The chemical elements most widely distributed in terrestrial living creatures are the ones (apart from inert helium and neon) that are commonest in the Universe — hydrogen, oxygen, carbon, and nitrogen. A chemically different Universe would clearly have different biology, if any. We explore here the nuclear processes in stars, the early Universe, and elsewhere that have produced these common elements, and, while we are at it, also encounter the production of lithium, gold, uranium, and other elements of sociological, if not biological, importance. The relevant processes are, for the most part, well understood. Much less well understood is the overall history of chemical evolution of the Galaxy, from pure hydrogen and helium to the mix of elements we see today. One implication is that we cannot do a very good job of estimating how many stars and which ones might be orbited by habitable planets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006561811750
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    EXTRAGALACTIC DISTANCE SCALES: it H 0 FROM HUBBLE (EDWIN) TO HUBBLE (HUBBLE TELESCOPE) (1997)
    Springer
    Space science reviews 79 (1997), S. 793-834 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the first fifty years after Edwin Hubble announced a linear relationship between distances and redshifts of external galaxies, the accepted value of his constant dropped by (or the Universe expanded and aged by) a factor of 5 to 10. More recently, different groups, often using nearly the same data, have passionately defended distance scales that differ by about a factor of two. The sections of this review explore (1) the history of extragalactic distance scales, (2) the relationships between the Hubble constant, H 0, and other cosmological parameters, (3) types of distance indicators, (4) ways of measuring distances in practice, (5) values of H 0 reported recently on the basis of these methods, (6) the continuing discrepancies between the 'long' and 'short' distance scales, and (7) prospects for future convergence on a single, global value of H, so that we can all get back to doing other things. The units of the Hubble constant are km s-1 Mpc-1 (or reciprocal time), and no one now strongly favors any value outside the range 40–90 km s-1 Mpc-1 (time scales of 11–25 Gyr).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004905101332
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Productivity and impact of large optical telescopes (1996)
    Springer
    Scientometrics 36 (1996), S. 237-246 
    Details
    ISSN: 1588-2861
    Source: Springer Online Journal Archives 1860-2000
    Topics: Information Science and Librarianship , Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract An attempt is made to provide quantitative measures of the amount of data gathered at large optical telescopes throughout the world and the impact these data have on astronomical research. The data base comprises 1163 papers reporting data from 39 telescopes, published between January 1990 and June 1991, and 4052 citations to them in 1993. Productivity measured in papers per square meter of telescope mirror varies by a factor of six, and impact measured in citations per paper varies by a factor of more than 10. Predictably, high productivity and high impact are associated with telescopes located at good sites and fully supported for many years by organizations with large budgets. Low productivity and low impact are associated with less favorable locations, short periods of operation, and financial stringency. In addition, the most productive telescopes seem to be ones whose users include astronomers from a wide range of geographical locations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02017316
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    Paper (German National Licenses)
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