HackerTube / Video
Nuclear Propulsion in Space
US National Archives
A 1968 NASA film from the US National Archives explaining why the US needed a nuclear rocket and how the engine works. It also shows combined nuclear and chemical stages for a manned Mars mission.
HN people link it as an old-timey explainer for nuclear thermal propulsion, and as evidence these engines were already built and tested.
4 Hacker News mentions · 2018–2020