Back in 1962, engineers argued over using nuclear, chemical, or electric...

https://travispyuj085.raidersfanteamshop.com/nuclear-vs-electric-propulsion-for-mars-which-one-wins

Back in 1962, engineers argued over using nuclear, chemical, or electric propulsion. It wasn't just theory; it defined the limits of our reach. By reading their old memos, we see how these debates shaped today’s hardware