The Holmdel horn

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Here is a brief article on the beginning of a effort to preserve the antenna used by two AT&T Bell Lab guys to discover the cosmic microwave background.  It was instrumental in their sharing of the Nobel Prize.

https://spectrum.ieee.org/cosmic-microwave-background

I remember a couple of things about the cosmic microwave background from college.  First, that this red-shifted radiation from the big bang represents a temperature of roughly 3 degrees Kelvin (above absolute zero).  And second, that heat transfer due to radiation of a warm mass to the surroundings is proportional to the delta T (difference in temperature) raised to the fourth power.

So if you go outside, lightly dressed, on a clear, calm summer evening and just stand around looking at the stars you'll find yourself feeling cold rather quickly, your body is radiating to that 3 degree Kelvin canopy of space.

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm