  We study the time evolution of freely rolling moduli in the context of
M-theory on a G_2 manifold. This free evolution approximates the correct
dynamics of the system at sufficiently large values of the moduli when effects
from non-perturbative potentials and flux are negligible. Moduli fall into two
classes, namely bulk moduli and blow-up moduli. We obtain a number of
non-trivial solutions for the time-evolution of these moduli. As a generic
feature, we find the blow-up moduli always expand asymptotically at early and
late time.
