  According to the planetary origin conceptual model proposed in this paper,
the protosun centre of the pre-solar nebula exploded, resulting in a shock wave
that passed through it and then returned to the centre, generating a new
explosion and shock wave. Recurrent explosions in the nebula resulted in a
spherical standing sound wave, whose antinodes concentrated dust into rotating
rings that transformed into planets. The extremely small angular momentum of
the Sun and the tilt of its equatorial plane were caused by the asymmetry of
the first, most powerful explosion. Differences between inner and outer planets
are explained by the migration of solid matter, while the Oort cloud is
explained by the division of the pre-solar nebula into a spherical internal
nebula and an expanding spherical shell of gas. The proposed conceptual model
can also explain the origin and evolution of exoplanetary systems and may be of
use in searching for new planets.
