  We discuss the evolution of the universe in the context of the second law of
thermodynamics from its early stages to the far future. Cosmological
observations suggest that most matter and radiation will be absorbed by the
cosmological horizon. On the local scale, the matter that is not ejected from
our supercluster will collapse to a supermassive black hole and then slowly
evaporate. The history of the universe is that of an approach to the
equilibrium state of the gravitational field.
