G. Pa\'al and the cosmological revolution
  Gy\"orgy Pa\'al, the Hungarian cosmologist died in 1992. This article was
published twenty-five years later in the Hungarian Astronomical Association
(HAA, MCSE in Hungarian) 2017 yearbook for his memory. After short introduction
of the history of cosmology we briefly introduce the XX. century cosmological
discoveries. For his early years G. Pa\'al studied the large-scale
inhomogeneity in the Universe. He was one of the first astronomer who realized
some periodicity in the quasar redshift distribution. In the early 90s he also
studied the galaxy redshift distribution in the so-called pencil-beam survey
and suggested the quasi periodicity can be cause of the late inflation in the
Universe namely the Lambda cosmological constant.
