  Solid embryos of the Earth and the Moon, as well as trans-Neptunian binaries,
could form as a result of contraction of the rarefied condensation which was
parental for a binary. The angular momentum of the condensation needed for
formation of a satellite system could be mainly acquired at the collision of
two rarefied condensations at which the parental condensation formed. The
minimum value of the mass of the parental condensation for the Earth-Moon
system could be about 0.02 of the Earth mass. Besides the main collision, which
was followed by formation of the condensation that was a parent for the embryos
of the Earth and the Moon, there could be another main collision of the
parental condensation with another condensation. The second main collision (or
a series of similar collisions) could change the tilt of the Earth. Depending
on eccentricities of the planetesimals that collided with the embryos, the Moon
could acquire 0.04-0.3 of its mass at the stage of accumulation of solid bodies
while the mass of the growing Earth increased by a factor of ten.
