[HN Gopher] Exoplanets Could Help Us Learn How Planets Make Magn...
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       Exoplanets Could Help Us Learn How Planets Make Magnetism
        
       Author : rbanffy
       Score  : 46 points
       Date   : 2023-08-08 18:08 UTC (2 days ago)
        
 (HTM) web link (www.quantamagazine.org)
 (TXT) w3m dump (www.quantamagazine.org)
        
       | cwmoore wrote:
       | It may look something like this when you intersect field lines of
       | the planets in the Solar System:
       | 
       | https://ouruboroi.com/moire2
        
       | escapecharacter wrote:
       | Dreaming of an entire world rocky inner made of LK-99
        
       | spdustin wrote:
       | I recall reading that the large impactor theory was a major part
       | of our magnetic field. Theia's core became merged with ours,
       | increasing both the strength and the longevity of our molten
       | "dynamo"
        
         | radicaldreamer wrote:
         | Does the strength of the dynamo have a major impact on the
         | emergence of life?
        
           | breezeTrowel wrote:
           | I would assume so since a weak planetary magnetic field means
           | that the atmosphere is much more easily stripped off over
           | time via solar wind. Mars, having no magnetic field, is a
           | good example of this.
        
         | wheelerof4te wrote:
         | There must have been some large impact in Earth's past. That
         | huge asteroid belt field between Mars and Jupiter had to come
         | from a planet collision.
         | 
         | Who knows what else from Theia merged with proto-Earth.
        
         | nickdothutton wrote:
         | The core is larger than expected, which helps it maintain
         | heat/phase, hence dynamo effect. It is assumed this is because
         | there was a donor. Edited for typo.
        
       | SubiculumCode wrote:
       | I was going to make a joke (against HN policy) about the earth's
       | core being a superconductor, then found this Standford ?crank?
       | https://scholar.google.com/scholar?hl=en&as_sdt=0%2C5&q=Geom...
        
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       (page generated 2023-08-10 23:01 UTC)