NASA is considering repurposing a rover on Earth that was built to mirror the agency's Perseverance and Curiosity rovers on Mars. [Full Story](https://www.space.com/astronomy/moon/promise-me-the-moon-nasa-wants-to-send-spare-nuclear-powered-mars-rover-to-the-lunar-surface) The Polar Rover for Observation, Mapping, and In-Situ Exploration (PROMISE) could be a moon explorer in the future. Credit: NASA/JPL-Caltech