  The general solution of the system of General Relativity equations has been
found for isotropic Universe with the flat spatial distribution and
synchronized time taking into account a perfect dust and the cosmological
constant. Schwarzschild, Friedmann and Einstein-de Sitter solutions (as well as
all of their fusion with each other) are special cases of the found general
solution. A method of generating an infinite number of Tolman's like solutions
has been found. Exact solutions has been found for the spherically symmetric
gravitational field of perfect dust clouds in the expanding Universe filled
with radiation. A system of ordinary differential equations has been obtained
for the spherically symmetric gravitational field of perfect dust clouds in the
expanding Universe filled with radiation and nonrelativistic gas. A system of
equations has been obtained for the spherically symmetric gravitational field
of ultrarelativistic celestial body explosion (supernova, quasar). The problem
of a negative density of a perfect dust cloud in General Relativity has been
considered.
