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Apply JD's analogy to the momentum-energy four vector of a particle. In its_______________________________________________
proper frame its 3-momentum and 3-velocity are zero. In another inertial
frame, it has non-zero 3-momentum/velocity. This spatial component of the
momentum-energy four vector is merely a projection (a shadow) of the
magnitude invariant 4-vector upon the space axes of the new frame. It must
follow, by the JD analogy, that the particle is not really moving.
Bob Sciamanda
Physics, Edinboro Univ of PA (Em)
http://www.winbeam.com/~trebor/
trebor@winbeam.com
.