NASA Studies Aerogel Fission Fragment Rocket 200X Better ISP Than Chemical | NextBigFuture.com

NASA NIAC phase 1 studies development of a nuclear fission fragment rocket engine (FFRE) that is exponentially more propellent efficient than rocket engines currently used to power today’s space vehicles and could achieve very high specific impulse (>100,000 sec) at high power density (>kW/kg).