Will the cosmos expand forever or the expansion will stop and then the whole universe collapses to that point of spacetime from which the big bang started? Carroll (2004) shows that this will become clear in a formula that shows the fate of the cosmos: Ω0a^3+(1- ΩM0- Ω)a+ ΩM0=0 This simple cubic equation in terms of a, the scale factor, gives us predictive power. If there is no real solution to it then we have to expect “perpetual” expansion. And the current experimental data indeed favor such an open ended cosmic future. What do you think about this conclusion?