  String gas cosmology is an approach towards studying the effects of
superstring theory on early universe cosmology which is based on new symmetries
and new degrees of freedom of string theory. Within this context, it appears
possible to stabilize the moduli which describe the size and shape of the extra
spatial dimensions without the need of introducing many extra tools such as
warping and fluxes. In this lecture, the recent progress towards moduli
stabilization in string gas cosmology is reviewed, and outstanding problems for
the scenario are discussed.
