The critical density ρc required by general relativity to stop the universe expansion is 1x10-26 kg/m3. But the average density of the universe due to the cosmic bodies was evaluated as 3x10-28 kg/m3, which is smaller than ρc. Many scientists had expected that sufficient cosmic body mass would eventually be found to exceed ρc, and thus stop the expansion of the universe. However, sufficient mass, even with dark matter, has not been found. The dominant opinion has become that the universe will expand forever, especially as recent measurements indicate that the expansion is accelerating. This article proposes a universe of compressed stressed dark matter that does not expand forever. Rather, the expansion will stop and contract, and the universe will oscillate forever. This conclusion is based on the universe being a large body of approximate radius Ru, mass Mu, which is comprised mostly of ambient uniform density ρdm of compressive stressed dark matter that has permanently existed since matter became dominant over radiation. This article demonstrates that this stressed dark matter oscillates because all its radial elements oscillate in unison with the same period TSHM = 6.47x10^10 years but variable amplitude R A which increases with R, where A = 0.14x10^26 m. This article shows that the mass associated with the stressed dark matter together with the kinetic energy of the oscillations is such that the bulk of the mass of this stressed universe is this very density ρdm of stressed dark matter itself, and ρdm far exceeds ρc. This article demonstrates that the Hubble formula V = H R is the natural behavior of such a stressed universe, and that the expansion of such a universe presently accelerates but will eventually stop expanding and will begin to oscillate with a period TSHM = 6.47x10^10 years. Thus, this article offers a very new approach to study the universe, an approach which challenges conventional understanding with a totally new stressed model of the universe.