u/stu54

In the comments of the new Scott Manley video about the new NASA fission powered Mars mission someone mentioned the massive prize of Xenon.

It got me thinking about how Krypton Argon or even Neon should in theory allow for even better ISP numbers, and how they were mostly brushed aside because of thin energy budgets and the fact that Xenon can be stored per Kg in a lighter tank.

With a healthy Space Reactor 1 Freedom sized energy budget and present day cheap launch systems would Argon be worth considering again?