Sorry community, I know I have another outstanding relativity question but something else is currently troubling me. What got me thinking was the question of muons moving towards earth. Now according to their half lives very few of them should make it through 12Km of atmosphere.... ANALYSIS FROM GROUND Now due to t = (gamma) t0 as they are moving very fast in a lab frame their measured half life is longer so it makes sense that more make it to ground level. Due to L = L0/(gamma) If the muons were like spheres (just for sake of argument) then their dimension in the direction of motion would be squashed whereas dimension perpendicular to this wouldn't be ( so would the spherical particle appear like a flattened disc)??? FROM POINT OF ViEW OF MUON Wouldn't feel as though it is really living any longer still experience the 2.2 micro seconds half life (or whatever it was?) Length contraction: due to its motion it would feel as though it had only travelled L/(gamma) so ie less than the 12Km that would be measured in the lab frame. So my main question is about these two 'types' of length contraction one of the moving object itself as viewed from Earth and then the length contraction of the journey to Earth as experienced by the moving muon? Sorry to bother I promise I'm trying to get it sorted in my head!!! G.