In late June, NASA announced a new proposal to send a rover called PROMISE, which is short for Polar Rover for Observation, Mapping and In-Situ Exploration, to the lunar surface. The video NASA released about the project also showed Perseverance's landing on Mars, before cutting to show its replica here on Earth. However, NASA's announcement calls the new vehicle a "hybrid" of the engineering versions of the Perseverance and Curiosity rovers, so it will possibly bear characteristics from both. Before being renamed as PROMISE, Perseverance's test model used to be called Operational Perseverance Twin for Integration of Mechanisms and Instruments Sent to Mars, or OPTIMISM for short. That means PROMISE wouldn't need the sun at all to explore the moon and achieve its goals.