Circle the innermost planet aboard MESSENGER, the first mission to orbit Mercury. This app brings you inside NASA’s history-making study of Mercury – the first images of the entire planet, along with the detailed data on Mercury’s surface, geologic history, thin atmosphere and active magnetosphere that MESSENGER sends back every day. Get a detailed look at the MESSENGER spacecraft and its science instruments, browse the latest news and pictures, or trace the spacecraft’s path over Mercury as it scans the scorched surface of the Sun’s closest planetary neighbor. Can you take the heat?