Insights
Exploration
Lunar night, permanently shadowed craters, and long eclipse seasons are not a photovoltaics problem.
Nuclear
Specific energy decides which missions are possible. Chemistry sets a ceiling. The nucleus does not.
Deep technology
Materials, autonomy, and sensing only matter if they survive packaging, drift, and a real thermal environment.
National security
Navigation, communications, warning, and power are national-security systems whether or not anyone calls them that.