Perhaps a black hole could do some of the Heat phase, at least. From https://news.ycombinator.com/item?id=38450636 https://news.ycombinator.com/item?id=38450636

Perhaps a black hole could do some of the Heat phase, at least. From https://news.ycombinator.com/item?id=38450636 https://news.ycombinator.com/item?id=38450636 : "Using black holes as rechargeable batteries and nuclear reactors" (2023) https://arxiv.org/abs/2210.10587 https://arxiv.org/abs/2210.10587