If JuliaCon last week is any indication, there might be more Lisp in space in the future! As long as the runtime size can be shrunk down a bit, but it sounds like that's in the works too.
There weren't any talks I saw where anyone was actually running Julia in space, but Ronan Chagas' "Attitude control subsystem development using Julia" and Corbin Klett's "Realtime embedded systems testing with Julia" both get pretty close and point out reasons why you wouldn't quite want to run Julia on a satellite or plane just yet. Hopefully the videos capture the questions from the audience because there were some good followups!
How does that fit with your initial "If JuliaCon last week is any indication, there might be more Lisp in space in the future"?
Is this about some Lisp written in Julia? Some Lisp with interoperability with Julia? Or it's based on considering Julia itself a Lisp for some reason?