  The Kepler problem is considered in a space with the
Friedmann--Lemaitre--Robertson--Walker metrics of the expanding universe. The
covariant differential of the Friedmann coordinates (X=a(t)x) is considered as
a possible mechanism of the formation of galaxies and clusters of galaxies. The
cosmic evolution leads to decreasing energy of particles, causing free
particles to be captured in bound states. In this approach the evolution of the
universe plays the role usually inscribed to Cold Dark Matter.
