NASA announced the winners on Wednesday of the third annual Power to Explore Challenge, a national writing competition designed to teach K-12 students about the power of radioisotopes for space exploration. The competition asked students to learn about NASA’s Radioisotope Power Systems (RPS), “nuclear batteries” the agency uses to explore some of the most extreme destinations in the solar system and beyond. In 250 words or less, students wrote about a mission of their own enabled by these space power systems and described their own power to achieve their mission goals. “The Power to Explore Ch…