When that does happen, when the last star dies, it means that the only objects left in the universe generating appreciable energy will be the corpses of stars.
Madness string 95323
The burden of proof lies on those claiming that something is the case. They must show it to be true, that the thing exists. If they cannot, then it is assumed that it is not true. But a negative, that there are no examples of the thing existing, cannot be proven directly. It can only be disproven.