In 1962, engineers debated whether nuclear, chemical, or electric engines...

https://alexisqoem867.trexgame.net/the-anatomy-of-an-impossible-idea-why-lunar-orbit-rendezvous-sounded-like-madness

In 1962, engineers debated whether nuclear, chemical, or electric engines should lead the moon race. These memos prove even the best minds rarely agree when the physics are unproven