hi i'm new, i was doing some pondering after watching a show about new modes of transportation. one of the modes was for space travel and using solar sails. in the show it was stated that the main force would be from light emitted from the sun. i thought that was cool, as it was explained (and shown) that photons exert force upon the sail itself in a similar fashion to wind and conventional sails. i got to wondering how much does a photon weigh if anything. i say if anything because force = mass*acceleration. well at 186,000mps you'd think that we would be crushed by light. here's my question is it possible for light to actually not exist within known dimensions? that perhaps light is a product from the 5th dimension that warps the 3rd and 4th? now for the biggy, do i sound stupid?