From: helbig@asclothestro.multivax.de   
      
   In article , "Jay   
   R. Yablon"  writes:   
      
   > \_the nearly simultaneous arrival of the photons and neutrinos after a   
   > journey of some 160 000 yr\_   
   >   
   > I am in the midst of writing up a reply to recent comments from Phillip   
   > and  Lawrence.  But a quick question regarding the study cited by   
   > Steven.   
   >   
   > The quote above from the abstract has me scratching my head. Photons are   
   > massless while neutrinos do have a very tiny mass. So neutrinos will   
   > travel at a  rapid but still subluminal velocity.  So how after such a   
   > long journey can they arrive at nearly the same time? Unless the word   
   > \_nearly_/ was used to indicate an accounting for the small mass which   
   > would slightly delay their arrival?   
      
   The first physics talk I gave, as part of my studies at the university   
   of Hamburg, back in 1991 or so, discussed a paper by Arnon Dar   
   concerning limits on neutrino masses from lab experiments, astrophysics,   
   etc.  At least for some species, the best limits---then and now---come   
   from time-of-flight constraints such as those which Steve mentioned.   
   Yes, neutrinos have a mass, but it is very tiny.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)