"Cold fusion is a hypothesized type of nuclear reaction that would occur at, or near, room temperature. This is compared with the "hot" fusion which takes place naturally within stars, under immense pressure and at temperatures of millions of degrees, and distinguished from muon-catalyzed fusion. There is currently no accepted theoretical model that would allow cold fusion to occur."
https://en.wikipedia.org/wiki/Cold_fusion
"LENR is a type of nuclear energy based on the weak force. It has similar characteristics to fission and fusion, except there is no harmful radiation or hazardous waste. As an energy source, LENR works by generating heat in a catalyst process. The fuels or materials that are usually used in the LENR process are nickel metal (Ni) with hydrogen gas (H) or palladium (Pd) with deuterium (D). The initial testing and theory show that radiation and radioisotopes are extremely short lived and can be easily shielded.
LENR would be an ideal energetics solution. It could meet the world’s energy requirements while being cleaner and safer than current methods. NASA’s interest in LENR increased after the Widom-Larsen Theory was published. NASA began conducting experiments to determine how the LENR surface reactions occur and their characteristics. One appealing application for LENR previously identified by NASA is single-stage-to-orbit vehicles. LENR’s high energy density would be a huge advantage for these types of vehicles. NASA conducted a study in 2009 to design a LENR powered launch vehicle. LENR enabled very high performance engines that could revolutionize access to space."
https://nari.arc.nasa.gov/sites/default ... rcraft.pdf
