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army1987 comments on Where Fermi Fails: What is hard to estimate? - Less Wrong Discussion
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Yes, but why there would be more such reactors today than there were one billion years ago?
Be cause U atoms are heavy and migrate under the influence of gravity to the center. Their relative abundance steadily rising.
I don't know if is it enough to have some effect. But if we discover some exoplanets, hotter than expected, it would be indicative for a process like that.
I don't know, it just might be, that the radioactivity of a planet rises for a longer time than usually postulated. Certainly, the Galaxy's atoms are more and more radioactive.