The present paper gives the global existence of $BV$ solutions to
the radial motions of self-gravitating gases with damping. We
construct approximate solutions by a modified Glimm scheme,
considering the effects of the geometric source term, the integrand
term, and the damping term at the same time. With the strength of
the waves measured by $|\Delta(w-z)|$, where $(w,z)$ are the Riemann
invariants to the corresponding Euler equations, we prove that the
$BV$ norms of the approximate solutions are bounded.