[HN Gopher] Ryugu samples reveal traces of rock from before the ...
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       Ryugu samples reveal traces of rock from before the Sun existed
        
       Author : Brajeshwar
       Score  : 58 points
       Date   : 2023-08-03 15:03 UTC (1 days ago)
        
 (HTM) web link (arstechnica.com)
 (TXT) w3m dump (arstechnica.com)
        
       | autokad wrote:
       | really exciting stuff, waited years for this kind of news from
       | that mission. I think its the case our solar system is only part
       | of another previous solar system that went super nova. Finding
       | information about that previous system is pretty cool
        
         | dylan604 wrote:
         | pretty much all solar systems are remnants of the original
         | first generation stars though, yeah? if the universe started
         | with nothing but hydrogen, that was the source of the first gen
         | stars, then it took those dying off to give us He,O,C, etc.
         | 
         | The one that gets me is the theory that Earth is at least a
         | second generation planet. So, maybe Ryugu returned some of the
         | material that survived from what made up the first gen
         | planet(s) Earth was formed. The fact that Jupiter hasn't
         | hoovered all of that up is also impressive.
        
         | skywal_l wrote:
         | I think that all the elements present in the solar system that
         | are heavier than hydrogen were made by previous stars and
         | elements heavier that iron (or carbon I forget) were necessary
         | made by stars that went supernova.
         | 
         | It would be very surprising if all these stars were not
         | surrounded by rocky planets who themselves had volcanism and
         | thus a process of rock creation.
        
           | hughesjj wrote:
           | Technically speaking big bang nucleosynthesis/baryogensis
           | produced elements as heavy as lithium with some abundance,
           | but yeah still dominated by hydrogen (and whatever other
           | exotic non-baryonic .... stuff is out there)
           | 
           | - https://en.wikipedia.org/wiki/Baryogenesis
           | 
           | - https://en.wikipedia.org/wiki/Big_Bang_nucleosynthesis
           | 
           | Also, this is a great image showing the proportions of
           | elements based on source
           | 
           | https://en.wikipedia.org/wiki/Chemical_element#/media/File:N.
           | ..
        
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       (page generated 2023-08-04 23:00 UTC)