We study the large-time behavior of solutionsВ to the initial and initial boundary value problems with В large initial data for the compressible Navier-Stokes system В describing the В one-dimensional motion of a viscous heat-conducting perfect polytropic В gas in unbounded domains.В The temperature is В proved to be В bounded В from below and above independently of both time and space. Moreover, it is shown that the global solution is В  В asymptotically stable as time tends to infinity.В Note that the В initial data can be arbitrarily large.В This result is proved by using elementary energy methods.