On 25 June 2014 09:22, John Ross <[email protected]> wrote: > The shell is mostly an approximately equal number of very cold electrons > and positrons, all traveling randomly at 2.19 X 106 m/s. They are going > too fast to combine as positronium. > > Why is a particle moving "too fast to combine into positronium" - at about 1% of lightspeed - described as "very cold" ? Temperature is an emergent property of the average kinetic energy of particles!
And why don't these particles collide and annihilate , which would give rise to a background radiation of the specific wavelength equivalent to the masses involved (corrected for doppler shift if the shell is receeding) ? -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
