Kids love learning about space. NASA just launched its fourth Power to Explore Student Challenge, an exciting (and totally free to enter) science, engineering, technology, and mathematics (STEM) writing challenge for K-12th grade students in the United States. This interactive challenge invites students to learn about radioisotope power systems, a type of nuclear battery that has, for over 60 years, allowed NASA to explore the harshest, darkest, and dustiest parts of our solar system and enab...