  The Navier-Stokes transport coefficients for a granular gas of smooth
inelastic hard disks or spheres are determined from the inelastic Boltzmann
equation by means of Grad's moment method. The shear viscosity $\eta$, the
thermal conductivity $\kappa$ and the new transport coefficient $\mu$ (not
present for elastic collisions) are explicitly obtained as nonlinear functions
of the (constant) coefficient of restitution $\alpha$. The expressions of
$\eta$, $\kappa$, and $\mu$ agree with those previously obtained from the
Chapman-Enskog method by using the first Sonine approximation. A comparison
with previous results derived from Grad's moment method for two and three
dimensions is also carried out.
