  Space-like branes or S-branes are certain class of time dependent solutions
of M/string theories having isometries ISO(p+1) $\times$ SO(d-p-2,1), where
$d=11,10$ respectively and have singularities at t=0. In \cite{Roy:2006du}, we
found that the asymptotically flat S-branes have the structure of generalized
Kasner geometry near t=0. In this work we evaluate higher order $\alpha'$
corrections perturbatively to the heterotic string Kasner backgrounds to probe
the singularity at t=0. We generally find that the perturbative corrections do
not permit us to reach the singular point, as the supergravity framework fails
near $t \sim {\sqrt \alpha'}$ blurring the origin of space-like singularities.
This is analogous to the concept of stretched horizons in the case of black
holes.
