  Based on the large number of elliptical planetary nebulae I argue that about
55 per cent of all progenitors of planetary nebulae have planets around them.
The planets spin up the stars when the later evolve along the red giant branch
or along the asymptotic giant branch.
  The arguments, which were presented in several of my earlier works, and are
summarized in the paper, suggest that the presence of four gas-giant planets in
the solar system is the generality rather than the exception. I here continue
and: (1) examine the possibility of detecting signatures of surviving
Saturn-like planets inside planetary nebulae, and, (2) propose a model by which
the second parameter of the horizontal branch, which determines the
distribution of horizontal branch stars in the HR diagram, is the presence of
planets.
  A red giant branch star that interacts with a planet will lose a large
fraction of its envelope and will become a blue horizontal branch star.
