XPost: sci.space.policy, sci.physics   
   From: pcdhSpamMeSenseless@electrooptical.net   
      
   On 06/17/2017 10:48 AM, Sегgi о wrote:   
   >   
   >> The Parker probe will use a refrigeration system to lower the   
   >> temperature of the components of the spacecraft from 1,400 C to room   
   >> temperature. This is about the same temperature drop as the   
   >> temperature drop from the Sun’s surface to the maximum temperature of   
   >> our high temperature ceramics. So it should be possible to do this   
   >> temperature drop on the surface of the Sun using our highest   
   >> temperature ceramics.   
   >>   
   >   
   > the major constraint is; the limited amount of heat can the probe get   
   > rid of by radiate it out into cold space on the back side.  This is only   
   > a few hundred watts. (do the calculation)   
   > [hint http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/stefan.html ]   
   >   
   > this means the solar shield *must be* a wideband optical and heat reflector   
   >   
      
   And of course that the Sun does not have a solid surface.   
      
   Of course you could visit it at night. ;)   
      
      
   Cheers   
      
   Phil Hobbs   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)