The Rolls-Royce micro-nuclear reactor is seen as a promising method of providing a power source for a long-term human presence on the Moon.
The new design has a different look than the famous puffy white suits worn by moonwalkers of the 20th century. Rather, Axiom's prototype looked black with blue and orange detailing
Israel is set to get full support from the US space agency on their widely anticipated return to the Moon, set to launch in 2025.
A nuclear thermal engine for a space rocket could be three or more times as efficient as conventional chemical rockets.
NASA Administrator Bill Nelson warned that China's Moon ambitious could see them dominate resource-rich areas, or completely claim it, barring the US from the lunar surface.