# NASA canceled its rover. A startup is building nuclear power system for Moon without contract. - Date: 2026-04-15 - Category: Space & Aerospace VIPER is dead, NASA has no funded replacement for its polar lunar rover, and Zeno Power is building the only radioisotope power system designed for the dark without a NASA contract. PRISM in February 2026 and a 2027 hardware target are on a collision course. ---