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  • Ryugu samples reveal traces of rock from before the Sun existed

    From Jan Panteltje@21:1/5 to All on Thu Aug 3 05:42:06 2023
    Ryugu samples reveal traces of rock from before the Sun existed
    https://arstechnica.com/science/2023/08/ryugu-samples-reveal-traces-of-rock-from-before-the-sun-existed/
    Small bits of material in the asteroid contain isotopes made in specific stars.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Martin Brown@21:1/5 to Jan Panteltje on Thu Aug 3 14:06:41 2023
    On 03/08/2023 06:42, Jan Panteltje wrote:
    Ryugu samples reveal traces of rock from before the Sun existed
    https://arstechnica.com/science/2023/08/ryugu-samples-reveal-traces-of-rock-from-before-the-sun-existed/
    Small bits of material in the asteroid contain isotopes made in specific stars.

    It is a very neat trick to use the O17/O18 ratio in a dust grain to
    determine the sort of stellar processes that led to the grain formation.
    The grains were formed around another sun now long since expired and in
    one case possibly as a result of a supernova explosion (very high O18).

    --
    Martin Brown

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