[en] The explosive energy released at the death of massive stars in forming stellar systems will propagate into the intergalactic medium. There, under certain circumstances, a dense cooled shell will form with mass many times greater than the original ''seed'' system, whereupon gravitational instability and fragmentation of the shell can lead to the formation of new stellar systems. For z< or approx. =5 and for masses 10⁸< or =M/M/sub sun/< or =10¹², a very large amplification of original perturbations is possible, with galaxies naturally forming in small groups having velocity dispersions of order 200 km s^-1. Explosions before zroughly-equal5, which cool primarily because of the inverse Compton interaction with background radiation, will lead to production of very massive stars. The most interesting speculative predictions (not unique to this model) are that intergalactic space will be dusty, with significant absorption likely for objects seen from z>3, that unvirialized groups should lie on two-dimensional surfaces, that black holes with masses 10²--10⁴ M/sub sun/ may be common, and that very large (100 Mpc radius) cavities may have been produced by early explosions