Before revision: Radioisotope power systems (RPS) are an enabling technology for challenging solar system exploration missions by NASA to destinations where solar energy is weak or intermittent, or where environmental conditions such as dust can limit the ability of a mission to achieve its scientific or operational goals.
After revision: A radioisotope power system (RPS) are an enabling technology for challenging solar system exploration missions by NASA to destinations where solar energy is weak or intermittent, or where environmental conditions such as dust can limit the ability of a mission to achieve its scientific or operational goals.