From: usenet@schweikhardt.net   
      
   toadastronomer@gmail.com wrote   
   	in <08f6b025-a772-458c-a7c1-ca7289166909@googlegroups.com>:   
   # 05-OCT-2017   
   #   
   # If I'm on a planet in a galaxy far, far away, in a society at a technical   
   level   
   # on par with ours, and I work in a lab that detects neutrinos that, just by   
   luck,   
   # is 100,000 lyrs downstream of CERN, along their neutrino beamline to Gran   
   # Sasso, how excited would I be right now at seeing the CERN signal relative to   
   # what a stellar or terrestrial or reactor neutrino signal looks like at that   
   distance?   
      
   100.000 ly is not a galaxy far, far, away, but more like a Magellanic   
   Cloud close, close nearby.   
      
   OK. But consider the Earth is spinning. A 100.000 ly circle has a   
   circumference of, let me see, yes, about 628.000 ly (it's actually   
   a bit smaller because the beam is not in the equatorial plane, but   
   lets neglect that). This circle is "traversed" in 24 hours, which   
   is about seven light years per second. One beam-second is spread   
   along this distance. We also need to take into account the beam   
   divergence (I have no idea how large it is).  I'm reasonably sure,   
   the Magellings (is that a word?) would never notice in their labs   
   what hit them. If any neutrino hit their detector at all.   
      
   Maybe on a day the Earth stood still, a Gort type civilization could   
   detect a lone neutrino sent by earthlings, signaling "Klaatu barada   
   nikto".   
      
   Regards,   
      
   	Jens   
   --   
   Jens Schweikhardt http://www.schweikhardt.net/   
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