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Title: |
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ISOTOPES TELL SUN'S ORIGINA AND OPERATION |
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Author: |
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O. Manuel & Sumeet A. Kamat |
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Affiliation: |
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University of Missouri - Rolla, Rolla, MO, USA |
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Date Posted: |
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June 17, 2005 |
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Abstract (excerpt): |
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Measurements of isotope abundances and masses offer
these conclusions on the Sun. Abundances: The Sun and
its planets formed out of highly radioactive, poorly
mixed debris of a supernova that exploded 5 Gy ago. This
conclusion is based on measurements of a) the decay
products of actinide elements (235,238U, 244Pu) and
short-lived isotopes in meteorites and in the Earth, b)
residual excesses in meteorites of stable isotopes made
by the α-, r-, p- and s-processes of stellar
nucleosynthesis, c) excess 16O and excess 136Xe [6] in
the Sun itself, and d) linked chemical and isotopic
heterogeneities preserved in meteorites and planets.
Measurements on 22 atoms in the solar wind and 72
s-products in the photosphere [8] show that the Sun acts
as a huge plasma diffuser that selectively moves
lightweight elements and isotopes of each element to its
surface. Iron is the most abundant element in the Sun,
in rocky planets and in ordinary meteorites. |
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