From: nospam@de-ster.demon.nl   
      
   Thomas 'PointedEars' Lahn  wrote:   
      
   > Ross Finlayson wrote:   
   > > On 02/11/2026 05:43 PM, Thomas 'PointedEars' Lahn wrote:   
   > >> The energy dispersion relation for a photon is E = ? ?(K), and one finds   
   > >> ?(K) = k c, so E = ? k c = ?/(2π) (2π/?) c = (?/?) c.  But   
   > >>   
   > >>    p = ?/?,   
   > >>   
   > >> so for a photon   
   > >>   
   > >>    E = p c.   
   > >>   
   > >> The energy-momentum relation for a free particle in Minkowski space is   
   > >>   
   > >>    E^2 = m^2 c^4 + p^2 c^2  <==>  m = 1/c √(E^2 - p^2 c^2)   
   > >>   
   > >> so   
   > >>   
   > >>    E = p c  ==>  m = 0. ?   
   > >   
   > > [pseudo-scientific babbling]>   
   > > Solar sails work. If one suggests that it's "ionic wind"   
   > > others have that it's light plainly.   
   >   
   > Solar sails work, NOT because photons have non-zero mass, but because they   
   > have non-zero _linear momentum_ *even though* they have non-zero mass, as   
   > I just showed.   
      
   Photons, and photon mass(whatever)   
   have nothing to do with it.   
      
   Radiation pressure is a feature of the classical Maxwell equations,   
      
   Jan   
      
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