> seemingly reasonable assumptions/estimate I challenge the idea that all the assumptions hidden in the claim that life is ubiquitous are seemingly reasonable.

> seemingly reasonable assumptions/estimate I challenge the idea that all the assumptions hidden in the claim that life is ubiquitous are seemingly reasonable. For instance, we don't have the faintest idea of how likely it is that eukaryotic life evolves from prokaryotes or if prokaryotes can themselves become complex life forms. Next, we don't know the likelihood of complex life becoming intelligent. It's not like this is some natural goal of evolution, at least as far as we know. It may have been an extremely rare accident here on earth. There are many more such assumptions, some of which Fermi could not have known about. But we shouldn't ignore all the progress we have made since then.