https://www.frontiersin.org/journals/space-technologies/articles/10.3389/frspt.2023.1191300/full
In this paper we discuss the advantages and challenges of utilizing Fission Fragment Rocket Engines (FFREs) to dramatically reduce transit time in space trav...
fission fragment rocketfrontiersenginemarsfast
https://www.nasa.gov/general/aerogel-core-fission-fragment-rocket-engine/
To address the urgent need for advanced propulsion solutions, we propose the development of a nuclear fission fragment rocket engine (FFRE) that is
fission fragment rocketaerogelcoreenginenasa