  We present gravitation as a theory in which the coordinates are distances and
velocities between galaxies. We show that there are three possibilities for the
Universe to expand: decelerating, constant and accelerating, and it is shown
that the Universe is now in the latter phase. Assuming "Omega"_m=0.245, the
time at which the Universe goes over from a decelerating to an accelerating
expansion, occurs at 8.5 Gyr ago, at which time the cosmic radiation
temperature was 146K. The theory predicts also that now there is a positive
pressure, p=0.034g/cm^2, in the Universe. Although the theory has no
cosmological constant, we extract from it its equivalence and show that
"Lambda"=1.934x10^{-35}s^{-2}, which is in excellent agreement with
measurements. It is also shown that the three-dimensional space of the Universe
is Euclidean. Comparison with general relativity theory is finally made and it
is shown that the classical experiments as well as the gravitational radiation
prediction follow from the present theory, too.
