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  • 1
    Electronic Resource
    Electronic Resource
    Identifying sources of lead contamination by stable isotope techniques (1972)
    s.l. : American Chemical Society
    Environmental science & technology 6 (1972), S. 705-709 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es60067a003
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  • 2
    Electronic Resource
    Electronic Resource
    CONTEMPLATION OF THINGS PAST (1998)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Earth and Planetary Sciences 26 (1998), S. 1-21 
    Details
    ISSN: 0084-6597
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.earth.26.1.1
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  • 3
    Electronic Resource
    Electronic Resource
    Meteorites: Unexpected Antarctic chemistry (1986)
    [s.l.] : Nature Publishing Group
    Nature 319 (1986), S. 357-358 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE meteorites found in Antarctica during the past 16 years are clearly different from those found elsewhere in several well-understood ways. Approximately 7,000 have been collected-they are on average much smaller than other meteorites, because it is easier to identify a small black fragment on a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/319357b0
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  • 4
    Electronic Resource
    Electronic Resource
    Secular resonances and cometary orbits in the β Pictoris system (1994)
    [s.l.] : Nature Publishing Group
    Nature 372 (1994), S. 441-444 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Data from the Infrared Astronomy Satellite (IRAS) indicate that most A, F and G stars possess dusty disks8. However, /3 Pictoris is the only known star whose disk has been imaged directly9. This disk extends at least 1,000 AU from the star and may have an inner cleared zone similar ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/372441a0
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  • 5
    Electronic Resource
    Electronic Resource
    How special is Jupiter? (1995)
    [s.l.] : Nature Publishing Group
    Nature 373 (1995), S. 470-470 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] BUILDING Jupiter has long been a problem to theorists. Observations presented on page 494 of this issue1 confirm that the problem is indeed a serious one. The idea that stars and planetary systems including our Solar System form simultaneously from a disk-shaped nebula of gas and dust is an ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/373470a0
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  • 6
    Electronic Resource
    Electronic Resource
    Ways that our Solar System helps us understand the formation of other planetary systems and ways that it doesn't (1996)
    Springer
    Astrophysics and space science 241 (1996), S. 25-34 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Models of planetary formation can be tested by comparison of their ability to predict features of our Solar System in a consistent way, and then extrapolated to other hypothetical planetary systems by different choice of parameters. When this is done, it is found that the resulting systems are insensitive to direct effects of the mass of the star, but do strongly depend on the properties of the disk, principally its surface density. Major uncertainty results from lack of an adequate theoretical model that predicts the existence, size, and distribution of analogs of our Solar System, particularly the gas giants Jupiter and Saturn. Nevertheless, reasons can be found for expecting that planetary systems, including those containing biologically habitable planets similar to Earth, may be abundant in the Galaxy and Universe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644212
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  • 7
    Electronic Resource
    Electronic Resource
    Planetary Accumulation with a Continuous Supply of Planetesimals (2000)
    Springer
    Space science reviews 92 (2000), S. 311-320 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Previous calculations of the accumulation of small (∼10 km) planetesimals at ∼1 AU to form Mars-sized bodies assumed that the initial assemblage of planetesimals were all present at the outset. This is an obviously reasonable assumption in systems in which the time scale for growth time of ∼1026 g planetary bodies is long compared to estimates of the evolutionary time scale of a protosolar disk, as was the case in the pioneering work of Safronov (1969). It is now found that as a result of the preplanetary assemblage being unstable with respect to the runaway growth of the largest bodies, this is unlikely to be the case. The more realistic alternative of adding the initial planetesimals on a ∼105 year time scale is considered here, as well as the consequences of the initial planetesimals being considerably smaller than those assumed previously. It is found that although the time scale for runaway growth is now actually controlled by the availability of planetesimals, for planetesimal production time scales of ∼105 yrs, the final consequences are very similar. These calculations do show, however, that as a consequence of continuous infall during the runaway growth process, the late initial planetesimals are likely to be catastrophically disrupted by mutual collisions. For this reason, a more detailed treatment of the growth of planetesimals into planetary embryos will require a better understanding of the difficult problem of formation of the initial planetesimals themselves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005211732138
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  • 8
    Electronic Resource
    Electronic Resource
    Possible consequences of absence of “jupiters” in planetary systems (1994)
    Springer
    Astrophysics and space science 212 (1994), S. 23-32 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The formation of the gas giant planets Jupiter and Saturn probably required the growth of massive ∼ 15 Earth-mass cores on a time scale shorter than the ∼ 107 time scale for removal of nebular gas. Relatively minor variations in nebular parameters could preclude the growth of full-size gas giants even in systems in which the terrestrial planet region is similar to our own. Systems containing “failed Jupiters,” resembling Uranus and Neptune in their failure to capture much nebular gas, would be expected to contain more densely populated cometary source regions. They will also eject a smaller number of comets into interstellar space. If systems of this kind were the norm, observation of hyperbolic comets would be unexpected. Monte Carlo calculations of the orbital evolution of region of such systems (the Kuiper belt) indicate that throughout Earth history the cometary impact flux in their terrestrial planet regions would be ∼ 1000 times greater than in our Solar System. It may be speculated that this could frustrate the evolution of organisms that observe and seek to understand their planetary system. For this reason our observation of these planets in our Solar System may tell us nothing about the probability of similar gas giants occurring in other planetary systems. This situation can be corrected by observation of an unbiased sample of planetary systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984505
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  • 9
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    Variations in the Isotopic Abundances of Neon and Argon Extracted from Radioactive Minerals (1954)
    American Physical Society
    Details
    Publication Date: 1954-11-01
    Print ISSN: 0031-899X
    Electronic ISSN: 1536-6065
    Topics: Physics
    Published by American Physical Society
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  • 10
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    Spontaneous Fission Yields from Uranium and Thorium (1953)
    American Physical Society
    Details
    Publication Date: 1953-11-15
    Print ISSN: 0031-899X
    Electronic ISSN: 1536-6065
    Topics: Physics
    Published by American Physical Society
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