  A new theoretical hypothesis on the origin and formation of the solar and
extrasolar planetary systems is summarized and briefly discussed in the light
of recent detections of extrasolar planets, and studies of shock wave
interaction with molecular clouds, as well as H. Alfven's work on Sun's
magnetic field and its effect on the formation of the solar system (1962). We
propose that all objects in a planetary system originate from a small group of
dense fragments in a giant molecular cloud (GMC). The mechanism of one or more
shock waves, which propagate through the protoplanetary disk during the star
formation is necessary to trigger rapid cascade fragmentation of dense clumps
which in turn collapse quickly, simultaneously, and individually to form
multi-planet and multi-satellite systems. Magnetic spin resonance may be the
cause of the rotational directions of newly formed planets to couple and align
in the strong magnetic field of a younger star.
