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   sci.space.tech      Technical and general issues related to      3,113 messages   

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   Message 2,675 of 3,113   
   Keith Harwood to Cray74@gmail.com   
   Re: Liquid Hydrogen Refrigeration   
   24 Mar 05 18:02:54   
   
   From: vitalmis@optusnet.com.au   
      
   Cray74@gmail.com wrote:   
      
   > Henry Spencer wrote:   
   >> For one thing, the sky is substantially above 3K (more precisely,   
   > 2.7K).   
   >> That's the cosmic background temperature, yes, but there are   
   > foreground   
   >> objects as well, some of them moderately bright.  I don't remember   
   > what   
   >> the final total is, but if memory serves, it's noticeably above 3K.   
   >   
   > But is it below 20K? :)   
   >   
   > Mike Miller, Materials Engineer   
      
   IIRC it's about 10K.   
      
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