This question about Kilopower nuclear reactors got me thinking.

Answer(s) to How many nuclear fission reactors have been launched into space? How many are still there? suggest that most nuclear reactors still in space are pretty darn old.

Question: What was the most recent launch of a nuclear reactor, and what are the current barriers to launching the next one?

note: I'm not asking about RTGs which produce energy from simple radioactive decay, I'm asking about reactors that use chain reactions to produce a high rate of power production.


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